User:Circeus/Sandbox2

Includes:

bryology
pteridology

The most common/important terms of:

floristics and ecology
plant anatomy and cell biology

excludes most of:

plant embryology
phycology
mycology/lichenology
palynology
phytochemistry

Terms to integrate/verify/revise:

dichlamydeous
diplostemonous
dorsiventral
foliaceous
gynobasic
haplochlamydeous (apetalous?)
haplostemonous
heterochlamydeous
homochlamydeous
isobilateral
monocarpellate
monochlamydeous
obdiplostemonous
phyllary
stereome
theca
vascular bundle

!-9

!: suffixed to indicate that the specimen or item has been examined personally by the author.
∞: "many", used in flower descriptions instead of a number when the organs in question are too numerous to be worth counting.
1-9: often used instead of numerical prefixes, particularly for number above five, e.g. "3-merous", "6-adelphous".

A

abaxial: on the "underside" or "reverse" of an organ, most often leaves (vs. adaxial).
aborted: which has failed to develop correctly.
abscission: a plant's normal shedding of an organ that is mature or aged, such as leaves and floral parts.
acaulescent: with leaves and inflorescence rising from the ground, appearing to have no stem (vs. #caulescent; cf. #rosulate).
acaulous: acaulescent.
accessory structures: parts of fruits that do not form from the ovary.
accrescent: continuing to grow larger after anthesis.
- in particular, accrescent calyx, which is persistent and enlarges as the fruit grows and ripens.
accumbent: of cotyledons, folded in the seed against the radicle by their edge (vs. #incumbent)
acerose: acicular.^[1]
-aceae: suffix added to the stem of a generic name to form the name of a #family.
achene: dry indehiscent fruit containing a single seed, with a soft pericarp that is #adherent, but not adnate to the seed.
achenecetum: an infructescence formed of many achenes borne on the surface of an accessory structure; the raspberry is a prototypical example.
achlamydeous: of flowers, lacking both petals and sepals (vs. #chlamydeous).
acicular: needle-like, as the leaves of conifers, (cf. #linear, #subulate).^[1]
aciculate:
- acicular.
- Marked with fine scratches.
acme: the period when the plant or population is at its maximum vigor.
acostate: of moss and liverwort leaves, lacking a #costa (also #ecostate).
acrandrous: in mosses, having antheridia at the apex of the stem.
acrocarpous: in mosses, bearing its sporophytes at the apex of the main shoots (vs. #pleurocarpous).
acrodromous: a venation pattern where several #primary vein converge at least partly toward the apex (vs. actinodromous, cf. #campylodromous).
acrogynous: in liverworts, whose gynoecium terminate the main shoot (vs. #basigynous).
acropetal: moving from roots to leaves, e.g. of molecular signals in plants.
acroscopic: mostly in cryptogams, pointing toward the apex of the shoot or frond (vs. basiscopic).
acrotonic: (vs. #mesotonic, basitonic)
- a branching patterns where the branches are most developed near the apex of the stem.
- a growth pattern where new organs grow at the apex of shoots.
actinodromous: a venation pattern where several #primary vein diverge from each other and never converge again (vs. acrodromous, cf. #palinactinodromous).
actinomorphic: usually of flowers, presenting radial #symmetry, as a lily (vs. #zygomorphic).
actinostele: #protostele.^[2]
aculeate: bearing prickles, thorns or spines.
- aculeolate: bearing very small prickles.
acuminate:^[3]
- tapering at the apex to a long point with concave edges (cf. #lanceolate, attenuate).^[4]
- tapering abruptly into a concave point (the acumen) from a tip that is otherwise.
acutangular: sharply angular, with a cross section in the shape of an hypocycloid (vs. #obtusangular, #terete).
acute: ending in a straight point with an acute angle (vs. acuminate, #obtuse).^[4]
adaxial: on the "upperside" or "obverse" of an organ, most often leaves (vs. abaxial).
-adelphous: having stamens that are at least partly fused by their filaments and form a number of bundles indicated by the prefix.
adherent: presenting very superficial fusion an organ of a different kind, or only sticking to without fusion (vs. #coherent, adnate, #free).
adnate: completely fused to an organ of a different kind (vs. #connate, adherent, #free).
adventitious: produced in an abnormal position.
adventive species: a species that has been introduced accidentally and failed to establish itself.
aerenchyma: plant tissue with very large intercellular space for transport of air and gases.
aerial:
- in aquatic plants, borne above the surface of water (also #emergent, #emersed).
- more generally, growing or borne above the surface of the ground.
aestivation: the arrangement of perianth parts of a given Whorl in an unopened flower bud (cf. #vernation).
- cochleate aestivation
- contorted aestivation: with each member overlapping its neighbor on one side and being overlapped on the other.
- crumpled aestivation: wrinkled and crumpled together irregularly.
- decussate aestivation: in even numbers and forming an inner and outer whorl; also termed decussate-imbricate and imbricate-alternate.
- imbricate aestivation
- open aestivation: members of a whorl not touching each other.
- quincuncial aestivation
- valvate aestivation: member of a whorl touching at the edge without overlapping.
alar region: in mosses, an area near the base of the leaf with large thin-walled cells (the alar cells) capable of enlarging and shrinking in response to water, causing the leaf position to change (cf. #pulvinus).
alate: bearing #wings.
-ales: suffix added to the stem of a generic name to form the name of an #order.
alien species: introduced or otherwise non-native species.
allogamy: cross-fertilization between flowers of different plants (vs. autogamy).
alternate: mostly of leaves, borne singly at different levels along a shoot (vs. #opposite), with an angle on 190°, they are also #distichous, otherwise the phyllotaxy is #spiral.
alternipetalous: of stamens, alternating with the petals, usually also antesepalous.
alterisepalous: of stamens, alternating with the sepals, usually also antepetalous
ament: a catkin.
amphicarpic or amphicarpous: producing two distinct types of fruit.
amphigastrium: a leaf from the abaxial side of the stem in leafy liverworts with #inclined or #prostate habit (also #underleaf).
amphistomal: in a bitegmic ovule, having a micropyle formed by both integuments (vs. #exostomal, #endostomal).
amphitropous: of an ovule, bent so that the #micropyle points toward the #placenta, but with the #chalaza not aligned with the micropyle (cf. anatropous, #campylotropous, #orthotropous).^[5]
amplexicaul: of leaves, having #lobes at the base that enclose the shoot (cf. #perfoliate, auriculate).
anacrogynous: in liverworts, bearing the gynoecium on small #lateral growth.
anadromous: in ferns, having the first diverging vein of a #pinna or #primary lobe acroscopic (vs. #catadromous).
anantherous: without anther.
anatropous: of an ovule, bent 180° so its #micropyle points toward the placenta, with the #chalaza aligned with the micropyle (cf. amphitropous, #campylotropous, #orthotropous).^[5]
androdioecious: of plants, having both #perfect and male flowers, but on separate individuals, that is, having both androecious and #monoecious individuals (cf. andromonoecious, #polygamodioecious, #polygamomonoecious, #polygamous).
androecious: bearing only #staminate (male) flowers (vs. ).
androecium:
- the stamens of an angiosperm flower, collectively (vs. #gynoecium).
- in bryophytes, a cluster of antheridia and paraphyses, along with any surrounding specialized leaves.
androphore: a stalk or other structure that elevates the stamens (androecium) away from the #receptacle.
androgynophore: a stalk bearing both the androecium and gynoecium of a flower above the level of insertion of the perianth.
androgynous:
- in Carex, having both #staminate and #pistillate flowers in th same inflorescence, with the pistillate flowers normally at the base of the spike.
- in bryophytes, #synoicous (monoicous with male and female organs produced together).
andromonoecious: having both #perfect and male on the same individual (cf. androdioecious, #polygamodioecious, #polygamomonoecious, #polygamous).
anemochory: seed dispersal by the wind.
anemophily: pollination by the wind.
angiosperms: the "higher", or "flowering" plants, characterized by the developing seeds being enclosed in an ovary.
angustiseptate: flattened and divided by a #septum at the narrowest point (vs. #latiseptate).
anisomerous: of a flower, having #whorls of differing #merisms.
anisophyllous:
- in general, presenting leaves in pairs or in threes (whether alternate or #opposite) where one is markedly dissimilar.
- in bryophytes, presenting distinct leaves on secondary #shoots than on the primary shoot.
anisosporous: in bryophytes, producing two sizes of spore within a single sporangium.
annual plant: completing its life cycle and dying within one year (vs. #perennial, biennial).
annulus:
- in mosses, a ring of #deciduous cells that allow the dehiscence of the #capsule.
- in ferns, a structure of the sporangium that allows it to project the spores.
antepetalous: of stamen, matching the number of petals and aligned with them; also antipetalous (vs. antesepalous, cf. #diplostemonous, #obdiplostemonous).
anterior: away from the axis; usually abaxial.
antesepalous: of stamen, matching the number of sepals and aligned with them; also antisepalous (vs. antepetalous, cf. #diplostemonous, #obdiplostemonous).
anthela: an inflorescence where the main axis is shorter than lateral branches.
anther: the pollen-producing part of the stamen in angiosperms, usually composed of four sporangia paired in two #thecae (#dithecal; an anther with a single theca is #monothecal) linked by a #connective.
antheridiophore: in Marchantiales liverworts, a specialised branch that bears antheridia (vs. archegoniophore).
antheridium: the male sexual organs in bryophytes.
antherode: the sterile anther on a staminode.
anthesis:
- the time when a flower first opens.
- the period during which the flower is fully open and functional.
anthocarp: a fruit (such as a pome) with extra layers beyond the #pericarp formed from parts of the flower outside the gynoecium.
anthoecium: in Poaceae, a floret combined with its two #glumes (the #lemma and #palea).^[6]
anthophore: a stalk that elevates the androecium, gynoecium and corolla above the calyx and #receptacle.
anthotaxis:
- disposition of the flowers on a #shoot (cf. #phyllotaxy).
- inflorescence.
antrorse: directed towards or upwards (cf. #retrorse).^[7]
aperturate: of a pollen, presenting an aperture a thinner area or actual opening in the pollen wall (cf. #triaperturate, #tricolpate, #tricolporate, #triporate).
apetalous: without petals (cf. asepalous).
apex: the point furthest from the point of attachment (vs. #base).^[4]
apical: located at or near the apex.
apicifixed: of anthers, having the filament attached to the upper end, with the lower #free (vs. basifixed, #dorsifixed).
apiculate: terminating in a short, sharp and flexible point (cf. #cuspidate, #mucronate).^[8]^[4]
apocarpous: of a gynoecium, having #carpels that are completely distinct (though they may be slightly #connate).
apomixis: replacement of sexual with asexual reproduction, usually involving agamospermy in the case of angiosperms.
apopetalous: with non-#connate petals (cf. #sympetalous).
apophysis:
- in mosses, the sterile #basal portion of a #capsule (also #hypophysis).
- the part of a conifer cone scale that is exposed when the cone is closed.
apostemonous: with non-#connate stamens (cf. #synstemonous).
appendiculate:
- prolonged by an appendage of some sort.
- of anthers, having a #connective that extends beyond the space between the stamens.
appressed: pressed flat together.
arachnoid: having long, fine trichomes that tangles together in a cobwebby appearance.
arborescent: growing into a tree-like habit, normally with a single woody stem (cf. #frutescent, #suffrutescent).
archaeophyte: a non-native plant that has been present in a geographic area for a long time (vs. #neophyte).
archegoniophore: in Marchantiales liverworts, a specialised branch that bears archegonia (vs. antheridiophore).
archegonium: the female sexual organs in bryophytes.
arcuate: arched.
areole:
- the space enclosed by the #veinlets of a plant with #reticulate venation.
- in Cactaceae, the spot where the leaves (in the form of spines) and flowers are borne.
aril: a membranous or fleshy appendage that is an extension of the #funicle and partly or wholly covers a seed; smaller such extensions are #caruncles, arillodes or #strophioles depending on their location.
arillode: an aril-like appendage enclosing a significant part of the seed that is not an outgrowth of the #funicle.
aristate: of leaf, ending with a stiff bristle, the arista.^[9]
arthrodontous: in bryophytes, said of a peristome where the teeth are formed from only the remnants of cells (vs. #nematodontous).
articulate: jointed and separating easily, leaving a clean scar.
ascending: of a stem or shoot, curving upward (cf. #decumbent).
ascidiate
- in the shape of a pitcher, of a container.
- of a carpel, growing from a ring of tissue instead of a flat pane that closes on itself.
asepalous: without petals (cf. apetalous).
aseptate: without partitions or divisions (#septums; vs. #septate).
asperous: rough to the touch.
assurgent: rough to the touch.
astomatous: without stomata.
atactostele: a disposition of the vascular tissue where #vascular bundles are positioned with no obvious ring pattern; also termed "scattered vascular bundles".
ategmic: of an ovule, having no #integument.
attenuate:^[4]
- tapering at the base with concave sides (vs. acute).
- tapering the same way at the apex (cf. acuminate).^[3]
auriculate: having a pair of large, rounded #lobes (the auricles) at the base (cf. amplexicaul, #sagittate, #hastate).
autochory: dispersal of seeds by way of a built-in mechanism.
autogamy:
- the ability to be fertilized by pollen from the same plant; self-pollination.
- more generally, any self-pollination, whether or not successful (vs. allogamy).
autoicous: in bryophytes, producing antheridia and archegonia on the same plant, but grouped separately (vs. #synoicous).
awn: particularly in Poaceae, a stiff extension of a plant part.^[9]
axil: the upper angle between a shoot or leaf and its parent organ.
axillary: borne in or arising from the axil of a leaf.

B

baccate:
- of fruits, generally, berry-like fleshy and juicy.
- more specifically applied to #fleshy fruit without a hard endocarp (which are #drupaceous); includes berries, pomes, hesperidiums and pepos.
barb: a usually stiff trichome capable of catching on to other objects because of its shape (cf. #barbellate, #glochidiate).
barbellate or barbed: of trichome, having minute projections along its length (vs. #glochidiate).
bark: in woody plants, the protective layers of #shoots and roots out from the vascular cambium, comprising the cork and phloem.

*Basal membrane: [A structure related to the peristome]

basal:
- located at or near the base of an organ (vs. apical).
- in actinodromous and #palinactiodromous venation patterns, having the main veins diverging directly from the point of attachment (vs. #suprabasal).
base: the end of an organ located near the point of attachment (vs. #apex).^[4]
basifixed: of anthers, having the #filament joining to the anthers at the lower end (vs. apicifixed, #dorsifixed).
basipetal:
- developing sequentially from the apex towards the base.
- moving from leaves to roots, e.g. of molecular signals in plants.
basiscopic: mostly in cryptogams, pointing toward the apex of the shoot or frond (vs. acroscopic).
beak: a pointed projection, most often the elongated end of a #dry fruit.
beard: a tuft or other area of trichomes on a petal or tepal.
berry: an #indehiscent fruit with none of the pericarp layers are hard; hesperidiums and #pepos are specialized types of berries.
biennial plant: completing its life cycle in two years, and then dieing (vs. annual, #perennial).
bifid: divided in two from the apex down, forming two lobes (cf. #emarginate, #retuse).
bilabiate: having two lips; e.g. the form of the petals in many #irregular flowers.

bilateral: arranged on opposite sides.
membranous: thin, translucent and flexible, seldom green.
Bipinnate: Each leaflet also pinnate
bipinnate: twice pinnate; for example of a compound leaf with individual leaflets pinnately divided.
bipinnatisect: a pinnatisect leaf with deeply dissected segments.
Bisexual:
bisexual: bearing both male and female reproductive organs; usually, flowers with both stamens and carpels; hermaphrodite. See Sexual reproduction in plants.
bitegmic: (of an ovule), covered by two integuments.
Blade: the flat and laterally-expanded portion of a leaf
blade: the lamina or flattened part of a leaf, excluding the stalk.
Bloom: the waxy coating that covers some plants.
bole: the trunk of a tree, usually below the lowest branch; cf. canopy.
Bract:
Bract: the leaf-like or scale-like leafy appendages that are located just below a flower, a flower stalk, or an inflorescence; they usually are reduced in size and sometimes showy or brightly colored.
bract: modified leaf associated with flower or inflorescence, differing in shape, size or colour from other leaves (and without an axillary bud).
bracteole: small bracts borne singly or in pairs on the pedicel or calyx.
Branches:
Branching: dividing into multiple smaller segments.
branchlet: a small branch.
bristle (adjective: bristly): straight stiff hair (smooth or with minute teeth) or upper part of an awn (when the latter is bent and has a lower, stouter, and usually twisted part, called the column).

bryophyte: a botanical group including mosses and liverworts. Technically a classification of plants including three classes: hornworts (Anthocerotae), liverworts (Hepaticae) and mosses (Musci).
sport: a naturally occurring variant of a species, not usually present in a population or group of plants; a plant that has spontaneously mutated so that it differs from its parent plant.
Bud: an immature stem tip, typically an embryonic shoot, ether producing a stem, leaves or flowers.
- accessory bud: an embryonic shoot occurring above or to the side of an axillary bud.
- supernumerary bud
Bulb: an underground stem normally with a short basal surface and with thick fleshy leaves.
bulb: thick storage organ, usually underground, consisting of a stem and leaf bases (the inner ones fleshy).
bulbel: a bulb arising from another bulb.
bulbil: small deciduous bulb or tuber formed in the axil of a leaf or pinna; a means of vegetative propagation.
bulblet: a bulb arising from another bulb; a bulbil.
bullate: blistered or puckered.
Bundle scar:A small mark on a leaf scar indicating a point where a vein from the leaf was once connected with the stem.
burr: loosely, a prickly fruit; a rough or prickly propagule consisting of a seed or fruit and associated floral parts or bracts.
buttress root: a root growing from the above-ground stem or trunk, and providing support, as in the case of Ficus macrophylla, the Moreton Bay Fig.

C

Caducous: falling away early.
caducous: falling off early; compare persistent.
caespitose: tufted; e.g. the growth form of some grasses.
callus (plural calli): generally, a protruding mass of tissue; in orchids, fleshy outgrowths from the labellum which can be variously shaped from papillae to plates; in grasses, hardened extension from the base of a floret (formed from the rachilla joint and/or the base of the lemma) which may or may not elongate and is often covered in hairs or bristles.
Calyptra:
calyptra: a hood or lid; see operculum.
calyx tube: a tube formed by the fusion of the sepals (calyx), at least at the base.
Calyx: the whorl of sepals at the base of a flower, the outer whorl of the perianth.
campanulate: bell-shaped.
campylotropous: when the ovule is oriented transversely (i.e. with its axis at right angles to its stalk) and with a curved embyro sac; cf. amphitropous, anatropous, orthotropous.
canaliculate: channelled; with a longitudinal groove.
Canescent: with gray pubescence.
canopy: the branches and foliage of a tree; crown; cf. trunk.
Cantharophilous: beetle pollinated
capillary: (noun) a tube, pore or passage with a narrow internal cross-section; (adjective) slender, hair-like.
capitate: with knob-like head; of an inflorescence, with the flowers unstalked and aggregated into a dense cluster; of a stigma, like the head of a pin.
Capitulum: the flowers are arranged into a head composed of many separate unstalked flowers, the single flowers are called florets and are packed close together. The typical arrangement of flowers in the Asteraceae.
capsule: a dry fruit formed from two of more united carpels and dehiscing when ripe (usually by splitting into pieces or opening at summit by teeth or pores).
- acrocidal capsule
carina (adjective carinate): keel.
Carpel: the ovule-producing reproductive organ of a flower, consisting of the stigma, style and ovary.
carpel: a female organ borne at the centre of a flower, consisting of an ovary, a style and a stigma. The gynoecium is the collective term for all the carpels of a single flower.
cartilaginous: hard and tough; gristly.
caryopsis: a dry, indehiscent, one-seeded fruit in which the seed coat is closely fused to the fruit wall, as in most grasses.
casual alien: a plant that appears with no apparent human assistance but does not develop a sustained population(s). Plants that persist only by new introductions; cf. alien.
catkin: a spike, usually pendulous, in which the mostly small flowers are unisexual and without a conspicuous perianth; e.g. willows, poplars, oaks and casuarinas. The individual flowers often have scaly bracts; they are generally wind-pollinated. The catkins are usually shed as a unit.
caudate: having a narrow tail-like appendage.
Caudex: the hard base produced by herbaceous perennials used to overwinter the plant.
Caulescent: with a distinctive stem.
Caulescent: with a well developed stem above ground.
cauline: borne on an aerial stem, e.g. leaves, flower or fruits (when applied to the latter two organs, usually referring to older stems; = cauliflorous).
cell: (1) basic (microscopic) unit of plant structure, generally consisting of compartments in a viscous fluid surrounded by a wall; (2) cavity of an anther or ovary.
Cell:
centrifixed: of a two-branched organ attached by its centre, e.g. a hair, or anther.
Cespitose: forming dense tufts, normally applied to small plants typically growing into mats, tufts or clumps.
Chalazal:
chamber: cavity of an ovary.
Chambered pith: A form of pith in which the parenchyma collapses or is torn during development, leaving the sclerenchyma plates to alternate with hollow zones
chartaceous: with a papery texture.
chasmogamous: of flowers that are pollinated when the perianth is open; cf. cleistogamous.
chimera: an individual composed of two or more genetically different tissues, most commonly as a result of a graft and sometimes within the individual, by mutations and irregularities that occur during cell division.
Chiropterophilous: bat pollinated.
chiropterophilous: pollinated by bats.
chlorophyll: a green pigment in chloroplasts, essential for photosynthesis.
chloroplast: an organelle present in plant cells that contains chlorophyll.
cilia (singular cilium, adjective ciliate): generally, hairs more or less confined to the margins of an organ, like eye-lashes; in motile cells, minute, hair-like protrusions which aid motility.
Ciliate: with a fringe of marginal hairs.
circinate (circinnate): spirally coiled with the tip innermost; e.g. the developing fronds of most ferns.
Circumscissile: a type of fruit dehiscences were the top of the fruit falls away like a lid or covering.
Cladautoicous: Male and female inflorescences on separate branches of the same plant
Cladode:A flattened stem that performs the function of a leaf; an example is the pad of the opuntia cactus.
cladode: a photosynthetic stem, often leaf-like and usually with foliage leaves either absent or much reduced; cf. phyllode.
Cladophyll: a flattened stem that is leaf-like and green: used for photosynthesis, normally plants have no or greatly reduced leaves.
class: the principal category for taxa in a rank between division and order.
clathrate: latticed or pierced with apertures. In this structures, such as scales, this appearance is caused by thick cell walls between adjacent cells and thin cell walls on the sides of the cells that face the surfaces of the scale.
clavate: club-shaped.
claw: (1) narrow, stalk-like basal portion of petal, sepal of bract; (2) in Melaleuca, the united portion of a stamen bundle.
Claw: a noticeably narrowed and attenuate organ base, typically a petal. Viola.
Cleistocarpous:
Cleistogamous: self-pollination of a flower that does not open.
cleistogamous: of flowers that self-pollinate and never open fully, or self-pollinate before opening; cf. chasmogamous.
Climbing: typically long stems, that cling to other objects.
climber: a plant growing more or less erect by leaning or twining on another structure for support.
cline (adjective clinal): continuous morphological variation in form within a species or sometimes between two species.
clone: plants derived from the vegetative reproduction of an individual, all having the same genetic constitution.
coalescent: plant parts fused or grown together to form a single unit.
coherent: (of like parts) sticking together, but not firmly or solidly as in connate.
Coleoptile: protective sheathe on SAM
Coleorhiza: protecting layer of a seed
colleter: a multicellular, glandular hair that usually produces a mucilaginous substance and is located on sepals, stipules, or petioles, or on nearby parts of stems; commonly found on plants in the order Gentianales.
Columella:
columella: in flowering plants, the central axis of the cone or fruit, e.g. in Callitris.
column: (1) structure extending above ovary and incorporating the style and stamens; gynostemium; e.g. in orchids; (2) in grasses, the lower, stouter, and usually twisted part of an awn, distinct from the slender upper part or bristle.
columnar: shaped like a column.
commercial name: a name often of no botanical standing and not governed by the ICNCP. The term generally applies to names such as Trademark Names, names covered by Plant Breeders Rights, Patents and Promotional Names; often used to enhance the sale of a plant.
commissure: the seam or face by which two carpels adhere.
Complete:
Compound pistil:
Compound Umbel: is an umbel where each stalk of the main umbel produces another smaller umbel of flowers.
compound: composed of several parts, for instance a leaf with leaflets, a gynoecium with several carpels, or an inflorescence made up of smaller inflorescences.
compressed: flattened lengthwise, either laterally (from side to side) or dorsally (from front to back).
concolorous: the same colour throughout.
cone: a fruit, usually woody, ovoid to globular, including scales, bracts or bracteoles arranged around a central axis, e.g. in gymnosperms, especially conifers and Casuarina.
conflorescence: of an inflorescence when the overall structure substantially differs from that of its individual flowers; e.g. the bottlebrush multiple -flower head of callistemons.
Connate: when the same parts of a flower are fused to each other, petals in a gamopetalous flower. Petunia.
connate: fused to another organ (or organs) of the same kind; e.g. petals in a floral tube; cf. adnate.
Connective: the part of the stamen joining the anther cells.
Connective: the part of the stamen joining the anther cells.
connective: the part of an anther that connects the anther cells.
connivent: coming into contact or converging.
conspecific: belonging to the same species.
contiguous: adjoining, touching, but not united.
Continuous pith:
contorted: twisted out of the normal shape.
convolute: referring to the arrangement of floral or foliar organs in a bud when each organ or segment has one edge overlapping the adjacent organ or segment; a form of imbricate arrangement; contorted.
Cordate (cordata): Heart-shaped, stem attaches to cleft
cordate: heart-shaped, with the notch lowermost; of the base of a leaf, like the notched part of a heart.
Coriaceouse: with a tough or leathery texture.
coriaceous: leathery; stiff and tough, but somewhat flexible.
Corm: a compact, upright orientated stem that is bulb-like with hard or fleshy texture and normally covered with papery, thin dry leaves. Most often produced under the soil surface.
corm: fleshy, swollen stem base, usually underground, storing food reserves, with buds naked or covered by very thin scales; a type of rootstock.
corolla: collective term for the petals of a flower.
Corolla: the whorl of petals of a flower.
corona (adjective: coronate): literally, crown; (1) in flowering plants, ring of tissue arising from the corolla or perianth of a flower and standing between the perianth lobes and the stamens; e.g. the daffodil trumpet, passionfruit; (2) in grasses, a hardened ring of tissue surmounting the lemma in some species.
Corona: an additional structure between the petals and the stamens.
corymb (adjective corymbose): inflorescence with branches arising at different points but reaching about the same height, giving the flower cluster a flat-topped appearance.
Corymb: a grouping of flowers where all the flowers are at the same level, the flower stalks of different lengths forming a flat-topped flower cluster.
costa (adjective costate): a rib.
Cotyledon: 'Seed leaves' (First leaves sprouted: in a dicot, there are two cotyledons in a seedling)
cotyledon: primary leaf or leaves of an embryo, becoming the seed leaf or leaves.
Creeping: growing along the ground and producing roots at intervals along surface.
crenate: with blunt or rounded teeth, scalloped.
Crenulate: with shallow, small rounded teeth.
crenulate: minutely scalloped.
crisped: finely curled. A term generally applied to the edges of leaves and petals.
crown: see canopy.
Crown: the place where the roots and stem meet, which may or may not be clearly visible.
cruciform: cross-shaped.
crustaceous: hard, thin and brittle.
cryptogams: ferns, bryophytes, algae and fungi (including lichenized fungi); 'lower plants'; plants producing spores, and without stamens, ovaries or seeds, literally plants whose sexual reproductive organs are not conspicuous cf. phanerogam.
culm: in grasses, sedges, rushes, and some other monocotyledons, an aerial stem bearing the inflorescence; strictly, from the base of the plant to the lowest involucral bract (or base of the inflorescence).
cultigen: a plant whose origin or selection is primarily due to intentional human activity.
cultivar epithet: the defining part of a name that denominates a cultivar. Cultivars are designated by fancy (q.v.) epithets appended either to the scientific name or to the common name of the taxon to which they belong; they are not italicized but placed in single quotation marks, for example Rubus nitidoides 'Merton Early'. 'Merton Early' is the cultivar epithet.
Group: a formal category equivalent to or below the rank of genus. It distinguishes: (1) an assemblage of two or more cultivars within a species or hybrid; (2) plants derived from a hybrid in which one or more of the parent species is not known or is of uncertain origin; and (3) a range of cultivated plants of a species or hybrid which may exhibit variation but share one or more characters, which makes it worth distinguishing them as a unit.
cultivar: the term cultivar is derived from cultivated variety and denotes an assemblage of cultivated plants clearly distinguished by one or more characters (morphological, physiological, cytological, chemical or other); when reproduced (sexually or asexually), the assemblage retains its distinguishing characters. A cultivar may arise in cultivation or be introduced from the wild. It is a variant of horticultural interest or value. Cultivar names are written with single quotation marks around them e.g. 'Blue Carpet', 'Alba'. All new names established after 1 January 1959, must be in common language (that is, not in Latin) but names established in Latin prior to this date are retained in Latin form.
Cuneate (cuneata): Triangular, stem attaches to point
cuneate: wedge-shaped; with straight sides converging at base. See Leaf shape.
cuspidate: tipped with a cusp.
Cuticle: a waxy membrane covering some leaves and roots that is watertight.
cutting: a piece of plant, usually an apical tip of shoot structure but may be root or leaf, cut from plant and used for vegetative propagation.
cyathium: an inflorescence of unisexual flowers surrounded by involucral bracts, e.g. the flowers of Euphorbia.*
cyme (adjective cymose): inflorescence in which the main axis and all lateral branches end in a flower (each lateral may be repeatedly branched).
Cyme: is a cluster of flowers were the end of each growing point produces a flower. New growth comes from side shoots and the oldest and first flowers to bloom are at the top.
cypsela: a dry, indehiscent, one-seeded fruit formed from an inferior ovary.

D

Deciduous:
Deciduous: falling away after its function is completed.
deciduous: falling seasonally, for instance bark, leaves, petals; persistent.
decorticate: to shed or peel off the outer bark of a tree.
Decumbent: stems that lay on the ground but have the ends turning upward.
Decumbent: growth starts off prostrate and the ends become upright.
decumbent: with branches growing horizontally but turned up at the ends.
decurrent: extending downwards beyond the point of exsertion, e.g. when the base of a leaf is prolonged downwards along the stem in a raised line or narrow wing.
decussate: opposite, with successive pairs borne at right angles to the last; generally applied to the arrangement of leaves.
definite: of a constant number; e.g. twice as many stamens as the petals or sepals (or less), or an inflorescence ending in a flower or an aborted floral bud, typically a cymose inflorescence; cf. indefinite.
Deflexed: bending downward.
deflexed: bent downwards; compare inflexed.
Dehisce:
Dehiscent: the way a fruit openings and releases its contents, normally in a regular and distinctive fashion.
dehiscent: breaking open at maturity to release contents. Generally refers to the release of seed from some fruits; also pollen from anthers.
deltoid: with the shape of the Greek letter, i.e. like an equilateral triangle. See Leaf shape.
Deltoid (deltoidea): Triangular, stem attaches to side
dendroid: tree-like, branching like a tree.
dentate: toothed. See Leaf margin.
denticulate: finely toothed.
determinate: limited, usually in growth.
Determinate growth: Growing for a limited time, floral formation and leaves.
Diadelphous:
Dialypetalae:
Diaphragmed pith: Pith in which plates or nests of sclerenchyma may be interspersed with the parenchyma.
dichasium: a cymose inflorescence with all branches below the terminal flower in regular opposite pairs; compare monochasium.
Dichogamy: Flowers that cannot pollinate themselves because pollen is produced at a time when the stigmas are not receptive of pollen.
dichotomous: forking into two equal branches, resulting from an equal division of the growing tip.
dicotyledon: a flowering plant whose embryo has two (rarely more) cotyledons (seed leaves) (common usage: dicot.) compare monocotyledon (common usage: monocot.).
Didynamous:
Digitate (digitata): Divided into finger-like lobes
digitate: with segments spreading from a common centre, like the fingers of a hand; see also palmatisect.
Dimorphic: of two different forms.
dimorphic (dimorphous): of 2 different kinds (in respect to shape and/or size), for example of stamens, fronds, leaves.
dioecious: of plant, when male and female reproductive structures develop on different individuals; of infloresence, male and female flowers in separate infloresences; cf. monoecious.
Dioicous: Having two forms of gametophyte, one form bearing antheridia and one form bearing archegonia.
Diploid
diploid: with two full sets of chromosomes in the nucleus of a cell; having two complements of haploid chromosomes, that is the two complete sets of chromosomes, one from each of the parental gamete. This is expressed symbolically as 2n, where n = the gamete number of chromosomes.
Diplolepidous:
discolorous: of leaves, with upper and lower surfaces of a different colour.
disjunct: occurring in widely separated geographic areas, distinctly separate; applies to a discontinuous range in which one or more populations are separated from other potentially interbreeding populations far enough as to preclude gene flow between them.
disk (disc): a plate or ring of structures derived from the receptacle, and occurring between whorls of floral parts: in daisies, the central part of capitulum, hence disk flowers or florets.
Disk: an enlargement or outgrowth from the receptacle of the flower, located at the center of the flower of various plants. The term is also use as the central area of the head in composites were the tubular flowers are attached.
dissected: deeply divided; cut into many segments.
distal: remote from the point of origin or attachment; the free end; cf. proximal.
distichous: arranged in two opposite rows (and hence in the same plane).
distinct: separate or free, not united.
diurnal: of the day; occurring or opening in the daytime.
divaricate: wide-spreading.
divergent: spreading in different directions, generally upward.
division: the term used for the rank below kingdom in the taxonomic hierarchy.
Divisural line:
domatia: pits formed at the junction of two veins on the undersurface of leaves (mostly of rainforest plants); often modified appendages that shelter parasites and other micro-organisms.
Dormant: see Latent bud
Dormant: a state of no growth or reduced growth
dorsal: the back; at the back; in particular, away from the axis in a lateral organ or away from the substratum in a prostrate plant.
dorsifixed: attached at or by the back, e.g. anthers on a filament.
dorsiventral: having structurally different upper and lower surfaces, e.g. some leaves.
Double ferilization:
Drupe: outer fleshy part surrounds a shell with a seed inside.
drupe: a succulent fruit formed from one carpel; the single seed is enclosed by a stony layer of the fruit wall; kernel; e.g. peaches, olives and the fruit of Nitraria billardieri.

one of the two lateral petals of a flower of subfamily Faboideae of family Fabaceae, located between the adaxial standard (banner) petal and the two abaxial keel petals.

E

Earlywood:The portion of the annual ring that is formed during the early part of a tree's growing.
Ecad: a plant assumed to be adapted to a specific habitat.
ecological amplitude: the range of environmental conditions in which an organism can survive.
Ecotone: the boundary that separates two plant communities, generally of major rank: trees in woods and grasses in savanna for example.
Ectogenesis: variation in plants due to conditions out side of the plants.
Ectoparasite: a parasitic plant that has most of its mass outside of the host, the body and reproductive organs of the plant lives outside of the host.
elaisome: oily body attached to the seed.
Elater:
Elater:
ellipsoid: a 3-dimensional shape, elliptical in all sections through the long-axis.
Elliptic (elliptica): Oval, with a short or no point
elliptical (elliptic): planar, shaped like a flattened circle, symmetrical about both the long and the short axis; about twice as long as broad, tapering equally both to the tip and the base; oval.
emarginate: notched at apex (notch usually broad and shallow).
Embryo sac:
Embryo:
embryo: young plant contained by a seed.
enantiostyly: the condition in which the gynoecium protrudes laterally, to the right (dextrostyly) or to the left (sinistrostyly) of the androecium. example: Senna
endemic: having a natural distribution restricted to a particular geographic region; cf. native.
Endocarp: includes the wall of the seed chamber, the inner part of the pericarp.
endocarp: the innermost layer of the wall of a fruit; in a drupe, the stony layer surrounding the seed.
Endosperm:
endosperm: nutritive tissue in a seed; albumen.
Endostome:
Endothecium:
ensiform: shaped like the blade of a sword.
entire: having a smooth margin, not lobed, divided or toothed (it may be wavy or scalloped, but not incised).
Entomophilous: insect pollinated.
ephemeral: short-lived.
epicalyx: an involucre resembling an outer calyx; e.g. as seen in Hibiscus.
epicarp: the outer layer of the wall of a fruit, i.e. the 'skin'.
epicormic: said of buds shoots or flowers developing from the old wood of trees, especially after injury or fire.
epicotyl: the part of the plant axis or stem between the cotyledonary node and first foliage leaves.
bloom: a fine white or bluish waxy powder occurring on plant parts, usually stems, leaves and fruits. It is easily removed by rubbing.
epidermis: an organ's outermost layer of cells, usually only one cell thick.
Epidermis: a layer of cells that cover all primary tissue separating them from the outside environment.
Epigeal: living on the surface of the ground. See also terms for seeds.
Epigean: occurring on the ground.
Epigeic: plants with stolons on the surface of the ground.
Epigeous: on the ground. Used for leaf fungus that live on the surface of the leaf.
Epigynous:
epigynous: borne on the ovary; describes floral parts when attached above the level of the ovary and arising from tissue fused to the ovary wall; cf. hypogynous, perigynous.*
Epilithic: growing on the surface of rocks.
epilithic: see lithophytic.
Epipetalous: born on the corolla, often used in reference to stamens attached to the corolla.
epipetalous: of stamens that are attached to the petals.
Epiphloedal: growing on the bark of trees.
Epiphloedic: an organism that grows on the bark of trees.
Epiphragm:
Epiphyllous: growing on the leaves. For example, Helwingia japonica has epiphyllous flowers (ones that form on the leaves).
Epiphyte: growing on another organism but not parasitic. Not growing on the ground.
epiphyte (adjective epiphytic): one plant growing on another without deriving nourishment from it (in other words, not parasitic); compare parasite. Loosely, and incorrectly, applied to plants that are not terrestrial (they may grown on various inorganic or organic surfaces), and often to orchids, which are rock-dwelling (and therefore strictly lithophytic).
Epiphytic: having the nature of an epiphyte.
epitepalous: of stamens that are attached to the tepals.
epithet: the adjectival component in a binomial; final word or combination of words in a name of more than one word (other than a term denoting rank) that denominates an individual taxon.
Equinoctial: a plants that has flowers that open and close at definite times during the day.
equitant: of a leaf when folded lengthwise with edges adhering except at the base, where it clasps another leaf on the opposite side of the stem.*
Erect: having an essentially upright vertical habit or position.
Erect: growing upright.
erect: upright, more or less perpendicular to the ground or point of attachment.
ericoid: with leaves like the European heath (Erica), small and sharply pointed.
erose: with the margin irregular as though nibbled or worn away.
Escape: plant originally under cultivation that has become wild, garden plant growing in natural areas.
Eupotamous: living in rivers and streams.
Euryhaline: normally living in salt water but tolerant of variable salinity rates.
Eurythermous: tolerant of a wide range of temperature.
Evergreen:
Evergreen: remaining green in the winter or during the normal dormancy period for other plants.
evergreen: not deciduous, having leaves all the year round.
ex: in nomenclature, indicating that the preceding author proposed the name but did not legitimately publish it, and that the succeeding author referred to the first author when legitimately publishing the name. See Author citation (botany).
Exclusive species: confined to specific location.
Exocarp: the pericarp's outer part.
exocarp: the outer layer of the pericarp, often the skin of fleshy fruits.
Exostome:
Exothecium:
Exserted: sticking out past the corolla, the stamens protrude past the margin of the corolla lip.
exserted: projected beyond, e.g. the stamens beyond the corolla tube.
Exsiccatus: a dried plant, most often used for specimens in a herbarium.
exstipulate: without stipules.
extrastaminal: outside the stamens or androecium, usually referring to the location of a nectary disk.
extrorse: of anther locules, opening towards the outside of the flower; cf. introrse, latrorse.
Extrose: opening towards the outside of the flower.

F

F1 hybrid: a single cross; a plant breeding term for the result of a repeatable cross between two pure bred lines.
F2 hybrid: a plant breeding term for the result of a plant arising from a cross between two F1 hybrids; may also refer to self-pollination in a population of F1 hybrids.
facultative: of parasites, optional; compare obligate.
Falcate (falcata): sickle-shaped
falcate: curved like the blade of a scythe.
family: a formal group of one or more genera with features and/or ancestry in common; the term for the principal rank between order and genus.
fascicle: (adjective fasciculate) cluster, e.g. a tuft of leaves all arising from the same node.
fastigiate: parallel, clustered and erect, e.g. the arrangement of branches in the Lombardy Poplar.
felted: covered with very dense, interlocked and matted hairs with the appearance or texture of felt or woollen cloth.
ferruginous: rust-colored.
fertile: capable of producing fruit; of flowers when they produce seed or of anthers containing pollen.
fertilization: union of male and female gametes.
Fibrous: roots are thread-like and normally tough.
Filament: the stalk of a stamen
filament: (1) stalk of a stamen; (2) thread, one or a few cells thick.
filamentous: consisting of filaments or fibres.
Filiform apparatus:
filiform: thread-like. See Leaf shapes.
Fimbriate: finely cut into fringes, the edge of a frilly petal or leaf.
fimbriate: fringed.
fissure: a split or crack, often referring to fissured bark. also, a line or opening of dehiscence.
Flabellate (flabellata): Semi-circular, or fan-like
flabellate: fan-shaped.
flaccid: limp; tending to wilt; compare turgid.
Fleshy: soft and juicy.
Fleshy: roots are relatively thick and soft, normally made up of storage tissue. Roots are typical long and thick but not thickly rounded in shape.
flexuous (flexuose): bent alternately in different directions; zig-zag.
Floccose:
floccose: with a soft and woolly covering of hairs.
flora: (1) all the plants growing in a certain region or country; (2) an enumeration of them, generally with a guide to their identification (e.g. the present volume, the Flora of Victoria, the Flora of New South Wales and so on). In this case 'flora' is written with a capital F.
Floral axis:
Floral envelope:
floral leaves: the upper leaves at the base of the flowering branches.
Actinomorphic: parts of plants that are radially symmetrical in arrangement.
floral tube: tube bearing the perianth and stamens, consisting of tissue derived from the receptacle and/or perianth and/or stamens; hypanthium.
floret: a small flower; usually refers to the flowers of the daisy and grass families.
Flower bud:a bud from which only a flower or flowers develop
Flower bud:
capitulum: a dense cluster of sessile, or almost sessile, flowers or florets; a head.

Flower:
flower: the sexual reproductive structure of the angiosperms, typically with a gynoecium, androecium, perianth and an axis.
follicle: a dry fruit formed from one carpel, splitting along a single suture, to which the seeds are attached; cf. pod (of legume).
Foot:
forest: vegetation dominated by trees with single trunks (including closely arranged trees with or without an understorey of shrubs and herbs).
forma (in common usage, form): a taxonomic category subordinate to species and within the taxonomic hierarchy, below variety (varietas), usually differentiated by a minor character.
free central: of placentation, ovules attached to a free-standing column in the centre of a unilocular ovary.
free: not united with others organs of the same type; not attached at one end.
Free-central:
frond: a leaf of a fern, cycad or palm.
Fruit: a structure contain all the seeds produced by a single flower.
- aggregate fruit: a cluster of fruits formed from the free carpels of one flower, e.g. blackberry; cf. multiple fruit.
fruit: seed-bearing structure in angiosperms formed from the ovary, and sometimes associated floral parts, after flowering.
Fruticose: woody stemmed with a shrub-like habit. Branching near the soil with woody based stems.
Fugacious: lasting for a short time: soon falling away from the parent plant.
Funicle: the stalk that connects the ovule to the placenta.
funicle (funiculus): the stalk of an ovule.
Funiculus:
funnelform: with a form gradually widening from the base to apex; funnel-shaped.
Furcate: forked, dividing into two divergent branches.
fused: joined together.
fusiform: 3-dimensional, narrowing gradually from the middle towards each end; spindle-shaped.

G

galbulus: (in gymnosperms) a fleshy cone (megastrobilus); chiefly relates to those borne by junipers and cypresses and often mistakenly called berries.
gamete: (in ferns, gymnosperms and angiosperms) a cell or nucleus that fuses with another of the opposite sex in sexual reproduction.
gametophyte: plant that bears gametes; in ferns, usually a small but discrete plant very different from the sporophyte (which is normally considered the fern plant); in gymnosperms and angiosperms, a microscopic structure (part of the reproductive apparatus) not recognizable as a discrete plant.
gene pool: the range of genetic variation found in a population.
genotype: the genetic make-up of an individual.
genus (plural genera): a group of one or more species with features or ancestry (or both) in common. Genus is the principal category of taxa intermediate in rank between family and species in the nomenclatural hierarchy.
Germination:
germination: (1) of seeds, describing the complex sequence of physiological and structural changes that occur from resting to growth stage. (2) of a pollen grain; production of a pollen tube when contacting a stigma receptive to it; (3) of a spore of fungi/bacterium; change of state - from resting to vegetative.
gibbous (gibbose): when part of an organ is swollen; usually with a pouch-like enlargement at base.
Glabrate:
glabrescent: becoming glabrous, almost glabrous.
Glabrous: smooth without any pubescences at all.
glabrous: without surface ornamentation such as hairs, scales or bristles.
gland: a secretory structure within or on the surface of a plant; (loosely) a smooth, usually shining, bead-like outgrowth.
glandular hair: hairs tipped with a gland.
Glandular:
Glandular-punctate: covered across the surface with glands.
glaucous: with a whitish bloom, blue-green in colour; e.g. the surface of the young leaves of many eucalypts.
globose (globular): nearly spherical.
globulose: small or nearly spherical.
glochid: a barbed hair or bristle, e.g. the fine hairs in Opuntia.
glumes: bracts subtending the floret(s) of a sedge, or similar plant; in grasses forming the lowermost organs of a spikelet (there are usually 2 but 1 is sometimes reduced; or rarely, both are absent).
glutinous: sticky.
Gonioautoicous: Male is bud-like in the axil of a female branch
graft chimaera, sometimes called a graft hybrid: a taxon whose members consist of tissue from two or more different plants in intimate association originated by grafting. The addition sign "+" is used to indicate a graft-chimaera either as a part of a formula (e.g. Crataegus monogyna + Mespilus germanica), or in front of an abbreviated name (e.g. +Crataegomespilus 'Dardari'). The nomenclature of graft hybrids is governed by the International Code of Nomenclature for Cultivated Plants.
graft: (1) of a plant, the artificial union of plant parts; (2) a plant shoot suitable for grafting; loosely means a scion, sucker, or branch; (3) an old word for a spade's depth of soil; (4) a kind of spade used for digging drains.
granular: of a surface, covered with small rounded protuberances.
grass: a plant belonging to the family Poaceae.
grassland: low vegetation dominated by grasses.
groundcover: (1) of a plant, with a very flat and soil-hugging habit; (2) a term applied to describe a plant that covers the soil surface so densely that it smothers all beneath it.
Guard cell:One of the paired epidermal cells that control the opening and closing of a stoma in plant tissue.
gymnosperm: a seed-bearing plant with ovules borne on the surface of a sporophyll; includes, among others, conifers, Ginkgo, Gnetum and cycads.
Gymnostomous:
Gynandrium: combined male & female structure
gynobasic: of a style, arising near the base of the gynoecium, e.g. between the lobes of the ovary.
Gynodioecy: describes a plant species or population that has some plants that are female and some plants that are hermaphrodites.
Gynoecium: the whorl of carpels. May comprise one (syncarpous) or more (apocarpous) pistils. Each pistil consists of an ovary, style and stigma (female reproductive organs of the flower).
gynoecium: female parts of flower; the collective term for the carpels of a flower whether united or free; cf. pistil; androecium.
style: an elongated part of a carpel, or group of fused carpels, between the ovary and the stigma.
gynophore: stalk supporting the gynoecium (above the level of insertion of the other floral parts).
Gynostregium:

H

habit: the general external appearance of a plant, including size, shape, texture and orientation.
habitat: the place where a plant lives; the environmental conditions of its home.
hair: a single elongated cell or row of cells borne on the surface of an organ.
Half-inferior:
half-inferior: of ovary, partly below and partly above the level of attachment of the other floral parts; compare inferior, superior.
halophyte: a plant adapted to living in highly saline habitats; a plant that accumulates high concentrations of salt in its tissues.
hand-pollination: the controlled act of pollination that excludes the possibility of open-pollination.
haploid: of chromosomes, and relative to the phase of an alternation of generations in which the duplicated chromosome set or diploid condition is reduced; the condition when the chromosomes are not duplicated, e.g. the complement of chromosomes in the nucleus of a gamete; a single basic set of chromosomes in the nucleus of a cell. This may be expressed symbolically as n, where n = the gamete number of chromosomes.
Haplolepidous:
Hastate (hastata): shaped like a spear point, with flaring pointed lobes at the base
hastate: like the head of a halbert, i.e. narrow and pointed but abruptly enlarged at the base into two acute diverging lobes; may refer only to the base of a leaf with such lobes; cf. sagittate.
Haustorium:
Haustorial: specialized roots that invade other plants and absorb nutrients from those plants.
haustorium: in parasitic plants, a structure developed for penetrating the host's tissues.
head: see capitulum.
Heartwood:The older, nonliving central wood of a tree or woody plant, usually darker and harder than the younger sapwood. Also called duramen.
heathland: vegetation dominated by small shrubs which usually have ericoid leaves.
helicoid: coiled; of a cymose inflorescence, when the branching is repeatedly on the same side (the apex is often recurved); cf. scorpioid.
herb: a vascular plant that does not develop a woody stem; e.g. a violet.
perennial: non-woody plants that live for more than two years and the shoot system dies back to the soil level each year.
Herbaceous: non-woody and dying to the ground at the end of the growing season. Annual plants die, while perennials regrow from parts on the soil surface or below ground the next growing season.
Herbaceous: plants with shoot systems that die back to ground each year: both annual and non-woody perennial plants.
herbaceous: not woody; usually green, and soft in texture.
herbarium: a collection of preserved, usually dried, plant material. Also a building in which such collections are stored.
Herbs: see herbaceous.
hermaphrodite: see bisexual.
heteromorphic: of 2 or more distinct morphologies (e.g. of different size and shape).
hilum: the scar on a seed coat where it separates from its stalk (funicle).
hippocrepiform: horseshoe-shaped.
Hirsute: with long shaggy hairs, often stiff or bristly to the touch.
hirsute: bearing coarse, rough, longish hairs. See Indumentum.
hispid: having long erect rigid hairs or bristles, harsh to touch.
hoary: covered with a greyish to whitish layer of very short, closely interwoven hairs, giving a frosted appearance.
holotype: a type chosen by the author of a name; cf. a lectotype, which is chosen by a later author.
Homogamous: when the flower anthers and the stigma are ripe at the same time.
hort.: (never capiltalised) of gardens, an author citation used in two ways: (1) as a name misapplied by gardeners and (2) as an invalid name derived from horticultural writings of confused authorship.
hyaline: translucent; usually delicately membranous and colourless.
cross: to make something interbreed; the act of hybridization.
hybrid: a plant produced by the crossing of parents belonging to two different named groups, e.g. genera, species, varieties, subspecies, forma and so on; i.e. the progeny resulting within and between two different plants. An F1 hybrid is the primary product of such a cross. An F2 hybrid is a plant arising from a cross between two F1 hybrids (or from the self-pollination of an F1 hybrid).
hybrid formula: the names of the parents of a hybrid joined by a multiplication sign, e.g. Cytisus ardonoi × C. purgans.
Hydrophilous: Water pollinated, pollen is moved in water from one flower to the next.
Hypanthium:
hypanthium: see floral tube.
hypocotyl: of an embryo or seedling, the part of the plant axis below the cotyledon and node, but above the root. It marks the transition from root to stem development.
Hypogynous:
hypogynous: borne below the ovary; used to describe floral parts inserted below the ovary's level of insertion; cf. epigynous, perigynous.
Hypophysis:

I

illegitimate name (nomen illegitimum): a name not abiding by the rules of the botanical Codes, e.g. cultivars that have been Latinised after 1 Jan 1959; cultivar names with more 10 syllables or 30 letters; cultivar names that use confusing names of other plants, e.g. Camellia 'Rose'.
imbricate: overlapping each other; of perianth parts, edges overlapping in the bud (the convoluted arrangement is a special form of imbrication).
Immersed:
imparipinnate: a pinnate leaf with an odd number of pinnae (terminated by a single leaflet); compare paripinnate.
Imperfect:
in: in nomenclature, where the preceding author published the name in an article or book, authored or edited by the succeeding author.
inbreeding: the production of offspring between closely related parents leading to a high degree of similarity; self-fertilization is the most intense form of inbreeding.
incised: cut deeply and (usually) unevenly (a condition intermediate between toothed and lobed).
Included:
included: enclosed, not protruding; for example stamens within the corolla.
Incomplete:
incurved: bent or curved inwards; of leaf margins, when curved towards the adaxial side.
indefinite: variable in number; numerous; e.g. more than twice as many stamens as petals or sepals, or when an inflorescence is not terminated by a flower (and continues growing); cf. definite.
Indehiscent: fruits that do not have specialized structures for opening and releasing the seeds, they remain closed after the seeds ripen and are opened by animals, weathering, fire or other external means.
Indehiscent:
indehiscent: not opening in any definite manner at maturity; usually referring to fruit.
indeterminate: unlimited, usually in growth.
Indeterminate growth: Inflorescence and leaves growing for an indeterminate time, until stopped by other factors such as frost
indigenous: native to the area, not introduced, and not necessarily confined to the region discussed or present thruout it (hardly distinct from ‘native’ but usually applied to a smaller area). For example, the Cootamundra Wattle is native to Australia but indigenous to the Cootamundra region of southern New South Wales; cf. endemic.
indumentum: any surface covering, e.g. hairs, scales; a collective term for such coverings.
Indusium:
indusium: (1) a membrane covering the sporangia of some ferns; (2) a cup enclosing the stigma in Goodeniaceae.
Inferior:
inferior: of an ovary, at least partly below the level of attachment of other floral parts; compare superior.
inflated: swollen, like a bladder.
inflexed: bent sharply upwards or forwards; compare deflexed.
Inflorescence:
inflorescence: several flowers closely grouped together to form an efficient structured unit; the grouping or arrangement of flowers on a plant.
infraspecific: denotes taxonomic ranks below species level, for example subspecies.
infructescence: the grouping or arrangement of fruits on a plant.
infundibular (infundibularform): funnel-shaped.
Inoperculate:
inrolled: rolled inwards.
insectivorous: catching, and drawing nutriment from, insects.
Insertion:
integument: in general, any covering, but especially the covering of an ovule.
interjugary glands: in pinnate leaves, glands occurring along the leaf rachis between the pinnae (occurring below the single, and often slightly larger, gland at or just below the insertion of the pinnae); cf. jugary.
Internode: spaces between the nodes.
internode: the portion of a stem between two nodes.
interpetiolar: of stipules, between the petioles of opposite leaves.
intramarginal: inside but close to the margin, for example a vein in a leaf.
intrastaminal: inside the stamens or androecium, usually referring to the location of a nectary disk.
Exotic: not native to the area or region.
exotic: not native; introduced from another region or country.
Introrse: opening on the inside of the corolla, the stamens are contained within the margins of the petals.
introrse: of anther locules, with opening towards the centre of flower (at least in bud); cf. extrorse, latrorse.
invalid: use of names not validly published according to the Code; i.e. they are not strictly 'names' in the sense of the International Code of Botanical Nomenclature.
involucre: a group of bracts surrounding the base of a flowerhead; e.g. as seen in a daisy.
Involucre: A tube of thallus tissue that protects the archegonia
involute: rolled inwards, for example when the margins of a leaf are rolled towards the adaxial (usually upper) surface; compare revolute.

irregular: cannot be divided into two equal halves through any vertical plane; compare zygomorphic, actinomorphic, regular.

J

joint: a node or junction of two parts; articulation.
jugary: of glands, gland occurring on the rachis of a bipinnate leaf at the junction or attachment of pairs of pinnae or pinnules, as in some Acacia species; cf. interjugary.
juvenile leaves: formed on a young plant and different in form from the adult leaves.

K

keel: a ridge like the keel of a boat, e.g. the structure formed by the fusion of the two anterior petals of a flower in the Fabaceae.
kernel: see drupe.
kingdom: the highest generally employed category of the taxonomic hierarchy, above that of division (phylum).

L

labellum: lip; one of three or five petals which is (usually) different from the others, e.g. in Orchidaceae and Stylidiaceae.
labiate: lipped; where the limb of a corolla is divided into two parts, called an upper and lower lip, the two resembling an open mouth with lips.
lacerate: jagged, as if torn.
laciniate: slashed into narrow, pointed lobes.
lamella (plural lamellae, adjective lamellate): a thin, plate-like layer.
Lanate: with woolly hairs. Thick wool like hairs.
Lance-shaped, lanceolate (lanceolata): Long, wider in the middle
lanceolate: about four times as long as broad, broadest in the lower half and tapering to the tip; narrowly ovate (sometimes, and incorrectly, used to mean narrowly elliptic; like a lance head).
Late wood: The portion of the annual ring that is formed after formation of earlywood has ceased.
buds: An axillary bud whose development is inhibited, sometimes for many years, due to the influence of apical and other buds. Also known as dormant bud
Latent bud - An axillary bud whose development is inhibited, sometimes for many years, due to the influence of apical and other buds. Also known as dormant bud
buds]]:A bud located on the side of the stem, usually in a leaf axil.
lateral: attached to the side of an organ, e.g. leaves on a stem.
latex: a milky substance that exudes from such plants such as milk thistles, figs and dandelions.
latrorse: a type of anther dehiscence in which the anthers open laterally toward adjacent anthers. cf. introrse, extrorse
lax: loose, not compact.
Lax: non upright, growth not strictly upright or hangs down from the point of origin.

buds: A bud that produces a leafy shoot.
Leaf axils: the space created between a leaf and its branch. This is especially pronounced on monocots like bromeliads.
Leaf bud: A bud that produces a leafy shoot.

M

margin: the edge, as in the edge of a leaf blade.
Leaf scar: the mark left on a branch from the previous location of a bud or leaf.
sheath: a tubular or rolled part of an organ, e.g. the lower part of the leaf in most grasses.
vein: a strand of vascular tissue; nerve.
lamina: the blade of a leaf or the expanded upper part of a petal, sepal or bract.
leaf: an outgrowth of a stem, usually flat and green; its main function is food manufacture by photosynthesis.
Leaf: the photosynthetic organ of a plant that is attached to a stem, generally at specific intervals.
Leaflet - a separate blade among others comprising a compound leaf
leaflets: the ultimate segments of a compound leaf.
legume: (1) a fruit characteristic of the families Mimosaceae, Caesalpiniaceae and Fabaceae, formed from one carpel and either dihiscent along both sides, or indehiscent; (2) a crop species in the family Fabaceae; (3) a plant belonging to the Leguminosae (Fabaceae family).
lemma: the lower of 2 bracts enclosing a grass flower.
Lenticel: One of the small, corky pores or narrow lines on the surface of the stems of woody plants that allow the interchange of gases between the interior tissue and the surrounding air.
lenticel: a loosely packed mass of cells in the bark of a woody plant (used for gas exchange), visible on the surface as a raised powdery spot.
Lenticels: lens-shaped or warty patches of parenchymatous tissue on the surface of the stem.
lepidote: covered with small scurfy scales.
liana: a woody climbing plant, rooted in the ground (both liane and liana are used).
liane: a woody climbing plant, rooted in the ground.
Lignotuber: root tissue that allows plants to regenerate after fire or other damage.
lignotuber: a woody swelling of the stem below or just above the ground; contains adventitious buds from which new shoots can develop, e.g. after fire.
ligulate: (1) bearing a ligule; (2) strap-shaped.
Ligule - a projection from the top of the sheath on the adaxial side of the sheath-blade joint in grasses
ligule: (1) small membranous appendage on the top of the sheath of grass leaves; (2) a minute adaxial appendage near the base of a leaf, e.g. in Selaginella; (3) extended, strap-like corolla of some daisy florets.
Linear (linearis): Long and very narrow
linear: very narrow in relation to its length, with the sides mostly parallel. See Leaf shape.
lithophytic: growing on rocks; epilithic.
lobe: part of a leaf (or other organ), often rounded, formed by incisions to about halfway to the midrib.*
Lobed (lobata): With several points
loculus: a chamber or cavity, for example, within an ovary.
loculicidal: of a fruit, when it dehisces through the centres of loculi; cf. septicidal.
Loculus: the cavities located with in a carpel, ovary or anther.
lomentum: a pod-like indehiscent fruit that develops constrictions between the segments and at maturity breaks into one-seeded segments.
lunate: crescent-shaped.
lyrate: lyre-shaped; deeply lobed, with a large terminal lobe and smaller lateral ones.
Macaronesia: a biogeographic area encompassing the islands off the coast of NW Africa and Europe, including the Azores, Canaries, Cape Verde Islands and Madeira.
Macrophyllous: leaves with a branching vascular system.
Malacophilous: pollinated by snails and slugs.
Malaysia: Malay peninsula and North Borneo.
Malesia: a biogeographic region comprising Malaysia, Indonesia, New Guinea, and the Philippines.
mallee: growth habit in which several woody stems arise separately from a lignotuber; a plant with such a growth habit; vegetation characterized by such plants.
mangrove: a shrub or small tree growing in salt or brackish water, usually characterized by pneumatophores.
Marcescent:
Marginal:
marginal: occurring at or very close to the margin.
marsh: a waterlogged area; swamp.
mealy: covered with coarse, floury powder, sometimes due to collapsed hairs.
megaspore: the larger of two kinds of spores produced by a heterosporous plant giving rise to the female gametophyte; compare microspore.
megastrobilus: the larger of two kinds of cones or strobili produced by gymnosperms, being female and producing the seeds; compare microstrobilus.

a membranous expansion of a fruit or seed which aids in dispersal, for instance on pine seeds;

mericarp: one segment of a fruit (a schizocarp) that splits at maturity into units derived from the individual carpels, or a carpel, usually 1-seeded, released by the break-up at maturity of a fruit formed from 2 or more joined carpels.
meristem: a group of actively dividing tissues.
mesic: moist, avoiding both extremes of drought and wet; pertaining to conditions of moderate moisture or water supply; applied to organisms (vegetation) occupying moist habitats.
Mesocarp: the middle layer of the pericarp.
mesocarp: the fleshy portion of the wall of a succulent fruit inside the skin and outside the stony layer (if any), surrounding the seed(s); sarcocarp.
mesomorphic: soft and with little fibrous tissue, but not succulent.
mesophyll: photosynthetic tissue of a leaf, the central tissues between the upper and lower epidermis; a medium-sized leaf, with area between 20 and 180 cm^2.
mesophyllous: (of vegetation) of moist habitats and having mostly large and soft leaves.
mesophyte: a plant thriving under intermediate environmental conditions of moderate moisture and temperature, without major seasonal fluctuations.
microspore: the smaller of two kinds of spores produced by a heterosporous plant; compare megaspore.
microstrobilus: the smaller of two kinds of cones or strobili produced by gymnosperms, being male and producing the pollen; compare megastrobilus.
Midrib - the central vein of the leaf blade
midrib: the central, and usually most prominent, vein of a leaf or leaf-like organ; midvein.
Midvein - the central vein of a leaflet
midvein: see midrib.
Mixed: buds that have both embryonic flowers and leaves.
moniliform: resembling a string of beads.
Monocarpic: plants that live for a number of years then after flowering and seed set die.
monochasium: a cymose inflorescence with the branches arising singly; cf. dichasium.
monocots: abbreviation of monocotyledons.
monocotyledon: a flowering plant whose embryo has one cotyledon (seed leaf); compare dicotyledon.
Monodelphous: stamen filaments united into a tube.
monoecious: of vascular plants, where the male and female reproductive structures are in separate flowers but on the same plant; of inflorescence, including unisexual flowers of both sexes; cf. dioecious.
monograph: of a group of plants, a comprehensive treatise presenting an analysis and synthesis of taxonomic knowledge of that taxon; the fullest account possible (at the time) of a family, tribe or genus. It is generally worldwide in scope and evaluates all taxonomic treatments of that taxon including studies of its evolutionary relationships with other related taxa, and cytological, genetic, morphological, palaeobotanical and ecological studies. The term is often incorrectly applied to any systematic work devoted to a single taxon. Compare revision.
Monoicous: Having a single form of gametophyte bearing both antheridia and archegonia, either together or on separate branches.
monotypic: containing only one taxon of the next lower rank, e.g. a family with only one genus, or a genus that includes only a single species.
morphology: the shape or form of an organism or part thereof.
mucro: a sharp, short point.
mucronate: terminating in a mucro.
multicarpellate:
multiple fruit: a cluster of fruits produced from more than one flower and appearing as a single fruit, often on a swollen axis, as in Moraceae; cf. aggregate fruit.
muricate: covered with short hard protuberances.
mutation: an abrupt and inexplicable variation from the norm, such as the doubleness in flowers, changes in colour, or habit of growth.
even-pinnate: having an even number of leaflets in a compound leaf, = paripinnate.

N

Naked:
Naked:
generic name: the name of a genus, for example Acacia, Eucalyptus.
native: naturally occurring in an area, but not necessarily confined to it; cf. endemic.
natural hybrid: a hybrid taxon produced by chance in the wild.
naturalised: describing a plant, introduced from another region, that grows and reproduces readily in competition with the natural flora.
Nectar disk: when the floral disk contains nectar secreting glands, often modified as its main function in some flowers.
Nectar: a fluid produce by nectaries high in sugar content, used to attract pollinators.
nectar: a (usually sweet) fluid produced by the flowers of many plants, collected by bees and other insects.
Nectary: a gland that secrets nectar, most often found in flowers but also produced on other parts of plants too.
nectary (adjective nectariferous): a specialized gland that secretes nectar.
Nematodontous:
neophyte : a plant that was recently introduced to a geographic area; cf. archaeophyte.
nerve: see vein.
New World: the Americas.
node: the part of a stem where leaves or branches arise.
Node: were leaves and buds are attached to the stem.
nomen conservandum: (Latin) a name which although, contrary to the rules of nomenclature (usually a later synonym), must be adopted.
nomen illegitimum: (Latin) a name that is superfluous at its time of publication either because the taxon to which it was applied already has a name, or because the name has already been applied to another plant.
nomen invalidum: (Latin) a name that is not valid. It can also refer to a name that is not validly published. (Abbreviation: nom. inval.)
nomen nudum: (Latin) a name not published in accordance with the International Code of Botanical Nomenclature, usually without a diagnosis or description of the entity to which it applies, and without reference to either; such a name should not be used.
nomenclature: the naming of things; often restricted to the correct use of scientific names in taxonomy; a system that sets out provisions for the formation and use of names.
noxious: of plants, containing harmful or unwholesome qualities. Applied in conjunction with 'weed' to specifically describe a plant which legislation deems harmful to the environment. Each state and territory in Australia has specific legislation governing noxious weeds.
numerous: Stamens are described as numerous when there are more than twice as many as sepals or petals.
Nurse cells:
nut: a hard, dry, indehiscent fruit, containing only one seed.
nutlet: a small nut, one of the lobes or sections of the mature ovary of some members of the Boraginaceae, Verbenaceae, and Lamiaceae.

O

ob-: inversely; usually same shape as suffix but attached by the narrower end, for example obcordate, oblanceolate, obovate.
obconic: of a fruit, hypanthium, pistil or calyx structure; an inverted cone shape
Obcordate (obcordata): Heart-shaped, stem attaches to tapering point
obcordate: of a leaf blade, broad and notched at the tip; heart shaped but attached at the pointed end.
Oblanceolate (oblanceolata): Top wider than bottom
oblanceolate: a 2-dimensional shape, lanceolate but broadest in the upper third; cf. lanceolate.
obligate: of parasites, unable to survive without the host; compare faculative.
oblique: slanting; of a leaf, larger on one side of the midrib than the other, in other words asymmetrical.
Oblong (oblongus): Having an elongated form with slightly parallel sides
oblong: length a few times greater than width, with sides almost parallel and ends rounded.
Obovate (obovata): Teardrop-shaped, stem attaches to tapering point
obovate: of a leaf, a 2-dimensional shape of which the length is about 1.5 times the width, and widest above the centre.
Obtuse (obtusus): With a blunt tip
obtuse: blunt or rounded at the tip or apex; converging edges making an angle of more than 90°; compare acute. See Leaf shape.
Oceania: the islands of the Pacific (sometimes including Australia).
ocrea (ochrea): a sheath, formed from two stipules, encircling the node in Polygonaceae.
odd-pinnate: (imparipinnate) having an odd number of leaflets in a compound leaf.
odd-pinnate: pinnate with a terminal leaflet
Old World: the world known before the discovery of America; essentially Europe and Asia.
ontogeny: the sequence of developmental stages through which an organism passes.
Operculate:
operculum (calyptra): a lid or cover that becomes detached at maturity, e.g. in Eucalyptus, a cap covering the bud and formed by the fusion or cohesion of perianth parts.
Operculum:
Opposite: buds are arranged in pairs on opposite sides of the branch
opposite: (as adjective) leaves or flowers borne at the same level but on opposite sides of the axis; or (as verb) when something occurs on the same radius as something else, for example anthers opposite sepals; compare alternate.
Oral:
Orbicular (orbicularis): Circular
orbicular: flat and more or less circular.
order: a group of one or more families sharing common features, ancestry, or both.
Ornithophilous: pollinated by birds.
ortet: the original single parent plant from which a clone ultimately derives.
orthotropous: when an ovule is erect, with the micropyle directed away from the placenta; atropous; cf. amphitropous, anatropous, campylotropous.
oval: see elliptical.
Ovary:
ovary: the basal portion of a carpel or group of fused carpels, enclosing the ovule(s).
Ovary:
Ovate (ovata): Oval, egg-shaped, with a tapering point
ovate: shaped like a section through the long-axis of an egg and attached by the wider end.
ovoid: egg-shaped, with wider portion at base; 3-dimensional object, ovate in all sections through long-axis.
ovule: loosely, the seed before fertilization; a structure in a seed plant within which one or more megaspores are formed (after fertilization it develops into a seed).
Ovules:

P

palea: the upper of 2 bracts enclosing a grass flower.
Palmate (palmata): Divided into many lobes
palmate: (1) a compound leaf divided into several leaflets arising from the same point at the top of the petiole; (2) of veins in a simple leaf when they arise in a similar fashion.
palmatifid: deeply divided into several lobes arising from more or less the same level.
palmatisect: intermediate between palmate and palmatifid, i.e. the segments are not fully separated at the base; often more or less digitate.
Panicle: is a raceme with branches and each branch having a smaller raceme of flowers. The terminal bud of each branch continues to grow, producing more side shoots and flowers.
panicle (adjective paniculate): a compound raceme; an indeterminate inflorescence in which the flowers are borne on branches of the main axis or on further branches of these.
papilionate: butterfly-like; with a corolla like that of a pea.
papilla (plural papillae, adjective papillose): a small, elongated protuberance on the surface of an organ, usually an extension of one epidermal cell.
pappus: in daisy florets, a tuft or ring of hairs or scales borne above the ovary and outside the corolla (representing the missing calyx); a tuft of hairs on a fruit.
Paraphyses: Sterile hairs surrounding the archegonia and antheridia
parasite: an organism living on or in a different organism, from which it derives nourishment; compare saprophyte, epiphyte.
Parasitic: using another plant as a source of nourishment.
Pariental:
parietal: attached to the marginal walls of a structure, for example ovules attached to placentas on the wall of the ovary. See Placentation.
paripinnate, even-pinnate: pinnate lacking a terminal leaflet
paripinnate: having an even number of leaflets (or pinnae), that is terminated by a pair of pinnae as opposed to a single pinna; compare imparipinnate.
patent: of plants, spreading.
pectinate: pinnately divided with narrow segments closely set like the teeth of a comb.
Pedate (pedata): Palmate, with cleft lobes
pedate: with a terminal lobe or leaflet, and on either side of it an axis curving outwards and backwards, bearing lobe or leaflets on the outer side of the curve.
Pedicel: stem holding a one flower in an inflorescences.
pedicel (adjective pedicellate): the stalk of a flower.
Pedicel: the stem or stalk that holds a single flower in an inflorescence.
peduncle (adjective pedunculate): the stalk of an inflorescence.
Peduncle: stem holding an inflorescences, or a single flower.
Peduncle: the part of a stem that bears the entire inflorescence, normally having no leaves or the leaves are reduce to bracts. When the flower is solitary, it is the stem or stalk holding the flower.
Peduncular: referring to or having a peduncle.
Pedunculate: having a peduncle.
pellucid: transmitting light; for example, said of tiny dots in leaves visible when held in front of light.
Peltate (peltata): Rounded, stem underneath
Peltate:
peltate: shield-like; with stalk attached to the lower surface and not to the margin.
pendulous: hanging, for example an ovule attached to a placenta on the top of the ovary; compare suspended.
penicillate: tufted like an artist's brush; with long hairs towards one end.
penninervation (penninerved): with pinnately arranged veins.
pepo: type of berry formed from an inferior ovary and containing many seeds, usually large with a tough outer skin, for instance, pumpkin, cucumber.
perennating: of an organ that survives vegetatively from season to season. A period of reduced activity between seasons is usual.
perennial: a plant whose life span extends over several years.
perfect: of a flower, when bisexual.
Perfect: possessing both stamens and ovary (male and female parts)
Perfoliate (perfoliata): Stem through the leaves
perfoliate: with its base wrapped around the stem (so that the stem appears to pass through it), e.g. of leaves and bracts.
Perianth:
Perianth: A protective tube that surrounds the archegonia, characterises the Jungermannialean liverworts
perianth: the collective terms for the calyx and corolla of a flower (generally used when the two are similar).
Pericarp: the body of the fruit from its outside surface to the chamber were the seeds are, including the outside skin of the fruit and the inside lining of the seed chamber.
pericarp: the wall of a fruit, developed from the ovary wall.
Perichaetium: The cluster of leaves with the enclosed female sex organs
Perigonium: The cluster of leaves with the enclosed male sex organs
Perigynous:
perigynous: borne around the ovary, i.e. of perianth segments and stamens arising from a cup-like or tubular extension of receptacle (free from the ovary but extending above its base); cf. epigynous, hypogynous.
Peristome:
Persistent:
persistent: remaining attached to the plant beyond the usual time of falling, for instance sepals not falling after flowering, flower parts remaining through maturity of fruit; compare deciduous, caducous.
perule: (1) the scaly covering of a leaf or flower bud; (2) in camellias the final bracts and sepals become indistinguishable and are called perules; (3) a kind of sac formed by the adherent bases of the two lateral sepals in certain orchids.
Petal:
petal: in a flower, one of the segments or divisions of the inner whorl of non-fertile parts surrounding the fertile organs, usually soft and conspicuously coloured; compare sepal.
petaloid: like a petal; soft in texture and coloured conspicuously.
petiolate: subtended by a petiole.
petiole: the stalk of a leaf.
Petiole: a leaf stalk supporting a blade and attaching to a stem at a node
Petiolule -the leaf stalk of a leaflet
petiolule: the stalk of a leaflet.
phanerogam: gymnosperms and angiosperms; plants producing stamens and gynoecia; literally plants with conspicuous sexual reproductive organs; cf. cryptogams.
photosynthesis: the process by which sugars are made from carbon dioxide and water in cells containing chloroplasts; the chemical energy required from solar energy in the presence of the pigment chlorophyll.
phyllode (adjective phyllodineous): a leaf with the blade much reduced or absent, and in which the petiole and or rachis perform the functions of the whole leaf; e.g. many acacias; cf. cladode.
phytomelan a black, inert, carbonaceous material that lacks nitrogen, probably derived from catechol, that forms a crust-like covering of some seeds, commonly found in Asparagales, Asteraceae, etc.
pilose: covered with soft, weak, thin and clearly separated hairs, which are usually defined as long and sometimes ascending.
pinna (plural pinnae): a primary segment of a compound leaf.
pinnate: a compound leaf with leaflets arranged on each side of a common petiole or axis; also applied to how the lateral veins are arranged in relation to the main vein.
- abruptly pinnate: #paripinnate
Pinnate]] (pinnata): Two rows of leaflets
pinnatifid: pinnately lobed.
Pinnatisect (pinnatifida): Cut, but not to the midrib (it would be pinnate then)
pinnatisect: pinnately divided almost to midrib but segments still confluent.
pinnule: ultimate free division (or leaflet) of a compound leaf.
Pistil:
pistil: (1) a single carpel when the carpels are free; (2) a group of carpels when the carpels are united by the fusion of their walls.
Pith:
Pith: the spongy tissue at the center of a stem.
pith: the central region of a stem, inside the vascular cylinder; the spongy parenchymatous central tissue in some stems and roots.
placenta: the tissue within an ovary to which the ovules are attached.
Placentation:
placentation: the arrangement of ovules inside ovary; for example axile, free-central, parietal, marginal, basal, or apical.
Placentra:
Plant Breeders Rights (PBR): these rights, governed by Plant Breeder's Rights Acts give the plant breeder legal protection over the propagation of a cultivar, and the exclusive rights to produce and to sell it, including the right to license others to produce and sell plants and reproductive material of a registered, deliberately bred variety. Cf. UPOV.
community: an assemblage, in nature, of plants that characteristically occur together.
stem: the plant axis, either aerial or subterranean, which bears nodes, leaves, branches and flowers.
Stem: vascular tissue that provides support for the plant,
stalk: the supporting structure of an organ, usually narrower in diameter than the organ.
Plant Variety Rights (PVR): governed by the Plant Variety Rights the registration of new varieties is now governed by Plant Breeders Rights.
plicate: pleated; folded back and forth longitudinally like a fan.
-plinerved: (of leaves) a suffix indicating that the main nerves are lateral and arise from a point distinctly above the base of the leaf. Combined with a numerical prefix to form words like 3-plinerved, 5-plinerved, and so on. Such leaves are especially characteristic of the family Melastomataceae.
plumose: like a feather; with fine hairs branching from a main axis.
Plumule:the part of an embryo that give rise to the shoot system of a plant
plumule: the part of an embryo that gives rise to the shoot system of a plant; cf. radicle.
pneumatophore: a vertical, aerial (at low tide) appendage to the roots of some plants, through which gases are exchanged; e.g. on mangroves.
pod: (1) a legume, the fruit of a leguminous plant, a dry fruit of a single carpel, splitting along two sutures; (2) siliqua and silicula, the fruit of Brassicaceae, a dry fruit composed of two carpels separated by a partition.
Polar nuclei:
Pollen:
pollen: powdery mass shed from anthers (of angiosperms) or microsporangia (of gymnosperms); the microspores of seed plants; pollen-grains.
pollen-mass: pollen-grains cohering by a waxy texture or fine threads into a single body; pollinium; e.g. in orchids.
Pollination: the movement of pollen from the anther to the stigma.
pollination: the transfer of pollen from the male organ (anther) to the receptive region of a female organ (stigma).
pollinium: see pollen-mass.
polygamodioecious: having bisexual and male flowers on some plants and bisexual and female flowers on others; cf. androdioecious, andromonoecious, dioecious, monoecious, polygamomonoecious, polygamous.
polygamomonoecious: having male, female and bisexual flowers on the same plant; cf. androdioecious, andromonoecious, polygamodioecious, polygamous.
polygamous: having bisexual and unisexual flowers on the same plant.
polyploid: with more than two of the basic sets of chromosomes in the nucleus; any individual (or a cell) containing three or more complete sets of chromosomes. Various combinations of words or numbers with '-ploid' indicate the number of haploid sets of chromosomes; e.g. triploid = 3 sets, tetraploid = 4 sets, pentaploid = 5 sets, hexaploid = 6 sets, and so on.
pome: a fruit that has developed partly from the ovary wall but mostly from the floral tube, e.g., apple.
Pome]] - accessory fruit from one or more carpels in the family Maloideae
population: (1) all individuals of one or more species within a prescribed area; (2) a group of organisms of one species, occupying a defined area and usually isolated to some degree from other similar groups; (3) in statistics, the whole group of items or individuals under investigation.
Pore:
Poricidal: anthers opening by terminal pores.
posterior: the side nearest the axis; compare anterior.
Precocious: flowering before the leaves emerge.
prickle (adjective: prickly): hard, pointed outgrowth from the surface of a plant (involving several layers of cells but not containing a vein); sharp outgrowth from the bark, detachable without tearing wood; cf. thorn.
Prickle: an extension of the cortex and epidermis that ends with a sharp point.
Primary: roots that develops from the radicle of the embryo, normally the first root to emerge from the seed as it germinates.
pro parte: (Latin) in part; in nomenclature, to denote that the preceding taxon includes more than one currently recognized entity, and that only one of those entities is being considered.
Procumbent: growing prostrate or trailing but not rooting at the nodes.
procumbent: spreading along the ground but not rooting at the nodes: not as close to ground as prostrate.
Progynous: when the carpels mature before the stamens produce pollen.
propagules: a structure capable of producing a new plant; includes seeds, spores, bulbils, etc.
prophyll: a leaf formed at the base of a shoot, usually smaller than those formed later.
Prostrate: laying flat on the ground, stems or even flowers in some species.
Prostrate: growing flat on the soil surface.
prostrate: lying flat on the ground.
Protandrous: when pollen is produced and shed before the carpels are mature.
protandrous: male sex organs maturing before the female ones, e.g. a flower shedding pollen before the stigma is receptive; cf. protogynous.
prothallus: a gametophyte body, usually flattened and delicate; e.g. in ferns and fern allies.
protogynous: female sex organs maturing before the male ones, e.g. a flower shedding pollen after the stigma has ceased to be receptive; cf. protandrous.
proximal: near the point of origin or attachment; cf. distal.
pruinose: covered with a powdery, waxy material; with a bloom.
Pseudautoicous: Dwarf male plants growing on living leaves of female plants
pseudo: false; apparently but not genuine; e.g. pseudo-bulb = a thickened, bulb-like internode in orchids, or a corm.
Pseudoelater:
Pseudomonoicous:
Pseudoperianth: An involucre that resembles a perianth, but is made of thallus tissue, and usually forms after the sporophyte develops
Pseudoterminal:
puberulous (puberulent): covered with minute soft erect hairs.
pubescent: downy; covered with short, soft, erect hairs.
Pulvinus - the swollen base of a petiole or petiolule usually involved in leaf movements and leaf orientatio
pulvinus: a swelling at the base of a leaf or leaflet stalk, often glandular or responsive to touch.
punctate: marked with dots.
pungent: having a sharp hard point.
pyramidal: of a plant's form, tetrahedral, pyramid-shaped.
pyrene: the stone of a drupe, consisting of the seed surrounded by the hardened endocarp.
pyriform: pear-shaped.

Q

quadrate: more or less square.

R

raceme (adjective racemose): an indeterminate inflorescence in which the main axis produces a series of flowers on lateral stalks, the oldest at the base and the youngest at the top; cf. spike.
Raceme: is a flower spike with flowers that have stalks of equal length. The stem tip continues to grow and produce more flowers with the bottom flowers open first and blooming progresses up the stem.
Rachilla: a secondary axis of a multiply-compound leaf
rachilla (rhachilla): the axis of a grass spikelet, above the glumes.
Rachis: main axis of a pinnately compound leaf
rachis (plural rachises; rachides): the axis of an inflorescence or a pinnate leaf; for example ferns; secondary rachis is the axis of a pinna in a bipinnate leaf distal to and including the lowermost pedicel attachment
Rachis:
Radial: Symmetric when bisected from any angle (circular)
radial: with structures radiating from a central point as spokes on a wheel, for example, the lateral spines of a cactus.
radiate: of daisies, of a capitulum, with ray florets surrounding disc florets.
radical: springing from the root; clustered at base of stem.
Radicle: Initial root-determined cells (Root apical meristem)
radicle: the part of an embryo giving rise to the root system of a plant; cf. plumule.
rainforest: a forest dominated by broad-leaved trees with dense crowns that form a continuous layer (canopy) and with one or more of the following growth forms: epiphytes, lianas, treeferns, palms; eucalypts absent or are present only as isolated emergen, e.g. in Victoria, mesic vegetation is dominated by trees other than eucalypts, often with lianas and epiphytes.
ramet: an individual member of a clone.
ray: (1) zygomorphic (ligulate) flowers in a radiate flowerhead, that is, ray-florets/flowers, for example Asteraceae; (2) each of the branches of an umbel.
Receptacle: the end of the pedicel that joins to the flower were the different parts of the flower are joined together, also called the torus. In Asteraceae the top of the pedicel upon which the flowers are joined.
receptacle: the axis of a flower, in other words, floral axis; torus; for example in Asteraceae, the floral base or common receptacle is the expanded summit of the peduncle on which the flowers are inserted.
recurved: bent or curved backwards or downwards.
reflexed: bent sharply back or down.
registered name: a cultivar name accepted by the relevant International Cultivar Registration Authority.
registered trade mark: a trade mark formally accepted by a statutory trade-mark authority and distinguished by the international ® sign.
registration: (1) the act of recording a new cultivar name with an International Cultivar Registration Authority; (2) recording a new cultivar name with a statutory authority like the Plant Breeder’s Rights Office (3) recording a trade mark with a trade marks office. Compare registered trade mark.
regular: see actinomorphic.
Reniform (reniformis): Kidney-shaped
Reniform:
reniform: kidney-shaped.
Repent: creeping.
Reproductive: buds with embryonic flowers.
reticulate: forming a network (or reticulum), e.g. veins that join one another at more than one point.
retrorse: directed backwards or downwards; cf. antrorse.
retuse: with a blunt (obtuse) and slightly notched apex.
revision: an account of a particular plant group, like an abbreviated or simplified monograph. Sometimes confined to the plants of a particular region. Similar to a monograph in clearly distinguishing the taxa and providing a means for their identification; compare monograph.
revolute: rolled under (downwards or backwards), for example when the edges of leaves are rolled under towards the midrib; compare involute.
rhachis: see rachis.
Rhizautoicous: Male inflorescence attached to the female stem by rhizoids
Rhizome:
Rhizome: A horizontally orientated, prostrate stem with reduced scale-like leaves, normally growing under ground but also at the soil surface. Also produced by some species that grow in trees or water.
rhizome: a perennial underground stem usually growing horizontally. See also stolon.
rhombic: like a rhombus: an oblique figure with four equal sides; compare trapeziform, trullate.
Rhomboid (rhomboidalis): Diamond-shaped
rhomboid: a four-sided figure with opposite sides parallel but with adjacent sides an unequal length (like an oblique rectangle); see also rhombic.
rhomboidal: a shape, for instance of a leaf, that is roughly diamond-shaped with length equal to width.
Root Hairs: very small, often one cell wide, roots that do most of the water and nutrient absorption.
root hairs: outgrowths of the outermost layer of cells just behind the root tips, functioning as water-absorbing organs.
root: a unit of a plant's axial system which is usually underground, does not bear leaves, tends to grow downwards, and is typically derived from the radicle of the embryo.
Rootstock: the underground part of a plant normally referring to a caudex or rhizome.
rootstock: short, erect, swollen structure at junction of a plant's root and shoot systems, for example a corm. Also used to describe (1) a part of a budded or grafted plant which supplies the roots, also called a rootstock, or plants grown specifically to produce these; (2) plants or seeds with some specific attribute, for instance virus-free plants.
hip: the fruit of a rose.
rosette: when parts are not whorled or opposite but appear so, due to the contractions of internodes, e.g. the petals in a double rose or a basal cluster of leaves (usually close to the ground) in some plants.
Rosette: cluster of leaves with very short internodes that are crowded together, normally on the soil surface but sometimes higher on the stem.
Rostellate: like a rosette.
rostrate: with a beak.
Rosulate: arranged into a rosette.
rotate: circular and flattened; for example a corolla with a very short tube and spreading lobes (for instance some Solanaceae).
Round (rotundifolia): Circular
rudimentary: poorly developed and not functional; compare vestigial.
rugose: wrinkled.
rugulose: finely wrinkled.
runcinate: sharply pinnatifid or cleft, the segments directed downward.
Runner: an above ground stem usually rooting and producing new plants at the nodes.
Runner: an elongated, slender branch that roots at the nodes or tip.
runners: see stolon.
rush: a plant belonging to the family Juncaceae or, more loosely, applied to various monocotyledons.

Roots generally do not offer many characters used in plant identification and classification but are important in determining plant duration though in some groups they very important for proper identification including the grasses.

S

saccate: pouched.
Sagittate (sagittata): Arrowhead-shaped
sagittate: shaped like the head of an arrow; narrow and pointed but gradually enlarged at base into two straight lobes directed downwards; may refer only to the base of a leaf with such lobes; cf. hastate.
samara: a dry, indehiscent fruit with its wall expanded into a wing.
samphire: (in Australia) any plant of the tribe Salicorniae (chenopodiaceae), e.g. Sarcocornia, Halosarcia, Sclerostegia; or a community dominated by one or more of these species.
saprophyte (adjective saprophytic): an organism deriving its nourishment from decaying organic matter and usually lacking chlorophyll; compare parasite, epiphyte.
Sapwood:
scabrid (scabrous): rough to the touch with short hard emergences or hairs.
scale: (1) a reduced or rudimentary leaf, for example around a dormant bud; (2) a flattened epidermal outgrowth, such as those commonly found on the leaves and rhizomes of ferns.
Scaly:
Scandent: a stem that climbs.
scandent: climbing, by whatever means.
scape (adjective scapose): a stem-like flowering stalk of a plant with radical leaves.
scarious: dry and membranous.
schizocarp: a dry fruit formed from more than one carpel but breaking apart into individual carpels (mericarps) when ripe.
sclereid: a cell with a thick, often lignified, cell wall that is shorter than a fiber cell and dies soon after the thickening of its cell wall.
sclerenchyma: a strengthening or support tissue composed of sclereids or of a mixture of sclereids and fibers.
sclerophyll (adjective sclerophyllous): a plant with hard, stiff leaves; leaves stiffened with thick-walled cells.
scorpioid: of a cymose inflorescence, when it branches alternately on one side and then the other; cf. helicoid.
scrubland: dense vegetation dominated by shrubs.
Scutellum:
Secondary: roots forming off of the primary root, often called branch roots.
section (sectio): the category of supplementary taxa intermediate in rank between subgenus and series. It is a singular noun always written with a capital initial letter, in combination with the generic name.
secund: with all the parts grouped on one side or turned to one side (applied especially to inflorescences).
sedge: a plant belonging to the family Cyperaceae.
Seed:
seed: a ripened ovule, consisting of a protective coat enclosing an embryo and food reserves; a propagating organ formed in the sexual reproductive cycle of gymnosperms and angiosperms (together, the seed plants).
segment: part or subdivision of an organ, for example a petal is a segment of the corolla. A term sometimes used when the sepals and petals are indistinguishable.
self-pollination: also called selfing, the acceptance by stigmas of pollen from the same flower or from flowers on the same plant, which means they are self-compatible.
Semi-erect: Not growing perfectly straight.
Semiamplexicaul: the leaf base wraps around the stem, but not completely.
sensu lato: of a plant name, in its broadest sense.
sensu stricto: of a plant name, in its narrowest sense.
sensu: in the sense of.
Sepal:
sepal: in a flower, one of the segments or divisions of the outer whorl of non-fertile parts surrounding the fertile organs, usually green; compare petal.
calyx (plural calyces): the outer whorl of a flower, usually green; the sepals of one flower collectively.
septicidal: of a fruit, when it dehisces along the partitions between loculi; cf loculicidal.
septum (plural septa): a partition, for example the membranous wall separating the two valves of the pod of Brassicaceae.
Septum:
sericeous: silky with dense appressed hairs.
series: the category of supplementary taxa intermediate in rank between section and species. It is a plural adjective; for instance Primula subgenus Primula sect. Primula series Acaules.
serrate: toothed with asymmetrical teeth pointing forward; like the cutting edge of a saw.
serrulate: finely serrate.
sessile: without a stalk, e.g. of a stigma, when the style is absent.
seta (adjectives setose, setaceous): a bristle or stiff hair (in Bryophytes, the stalk of the sporophyte); a terminal seta is an appendage to the tip of an organ, e.g. the primary rachis of a bipinnate leaf in Acacia.
Seta:
Sheath - the proximal portion of a grass leaf usually surrounding the stem
shoot: usually the aerial part of a plant; a stem including its dependent parts, leaves flowers etc.
shrub: a woody perennial plant without a single main trunk, branching freely, and smaller than a tree.
sigmoid: shaped like the letter 'S'.
silicula: a stout siliqua (not more than twice as long as wide).
siliqua: a dry, dehiscent fruit (more than twice as long as wide) formed from a superior ovary of two carpels, with two parietal placentas and divided into two loculi by a 'false' septum.
silk]]y: densely covered with fine soft straight appressed hairs, with a lustrous sheen and satiny to the touch.
silviculture: the science of forestry and the cultivation of woodlands for commercial purposes and wildlife conservation.
Simple pistil:
simple: undivided, for instance a leaf not divided into leaflets (note, however, that a simple leaf may be entire, toothed or lobed) or an unbranched hair or inflorescence.
Single: one flower per stem or the flowers are greatly spread-apart as to appear they do not arise from the same branch.
sinuate: with deep, wave-like depressions along the margins, but more or less flat; compare undulate.
sinus: a notch or depression between two lobes or teeth in the margin of an organ.
Solitary: same as single, with one flower per stem.
solitary: single, of flowers that grow one plant per year, one in each axil, or widely separated on the plant; not grouped in an inflorescence.
Sorus / Sori:
- acrostichoid sorus: in ferns, a sorus without indusia where the sporangia are dispersed over the undersurface instead of grouped and forming lines.
spadix: a spicate inflorescence with a stout, often succulent axis.
spathe: a large bract ensheathing an inflorescence.
spathulate (spatulate): spoon-shaped; broad at the tip with a narrowed projection extending to the base.
Spatulate, spathulate (spathulata): Spoon-shaped
Spear-shaped (hastata): Pointed, with barbs
affinis]] (aff.): with affinity to others, akin to; often used for a provisionally recognized but unnamed taxon considered close to that name, perhaps a hybrid or extreme variant.
species: a group, or populations of individuals, sharing common features and/or ancestry, generally the smallest group that can be readily and consistently recognized; often, a group of individuals capable of interbreeding and producing fertile offspring. The basic unit of classification, the category of taxa of the lowest principal rank in the nomenclatural hierarchy.
specific epithet: follows the name of the genus, and is the second word of a botanical binomial. The generic name and specific epithet together constitute the name of a species; i.e. the specific epithet is not the species name.
spike (adjective spicate): an unbranched, indeterminate inflorescence in which the flowers are without stalks; cf. raceme.
Spike: when flowers arising from the main stem are without individual flower stalks. The flowers attach directly to the stem.
spikelet: a unit of the inflorescence especially in grasses, sedges and some other monocotyledons, consisting of one to many flowers and associated bracts (glumes).
spine (adjective spinose): a stiff, sharp structure, formed by the modification of a plant organ that contains vascular tissue; e.g. a lateral branch or a stipule; includes thorns.
Spine: an adapted leaf that is usually hard and sharp and is used for protection, and occasionally shading of the plant
spinescent: ending in a spine; modified to form a spine.
spiral: of arrangement, when plant parts are arranged in a succession of curves like the thread of a screw, or coiled in a cylindrical or conical manner.
Sporangium:
sporangium (sporangia): a structure in which spores are formed.
spore: in non-flowering plants only a simple propagule, produced either sexually or asexually, and consisting of one or a few cells.
sporocarp: a fruiting body containing spores.
Sporophyll:
sporophyte: a plant, or phase of a life cycle, that bears the spores; cf. gametophyte.
spreading: extending horizontally, for example branches; standing out at right angles to axis, for example leaves or hairs.
spur: (1) a short shoot; (2) a conical or tubular outgrowth from the base of a perianth segment, often containing nectar.
stamen (adjective staminate): male organ of a flower, consisting (usually) of a stalk (filament) and a pollen-bearing portion (anther).
Stamen:
Stamens:
Staminode:
Staminode: a sterile stamen.
staminode: a sterile stamen, often rudimentary.
Staminodial: flowers with sterile stamen.
standard specimen: a representative specimen of a cultivar (or other taxon), one that demonstrates how the name of that taxon should be used.
standard: the large posterior petal of pea-flowers.
Stegocarpous:
stellate: star-shaped, for example a type of hair.
stem-clasping: see amplexicaul.
sterile: infertile, for example a stamen that does not bear pollen, or a flower that does not bear seed.
stigma: the pollen-receptive surface of a carpel or group of fused carpels, usually sticky; usually a point or small head at the summit of the style.
Stigma:
stipe: in ferns, the stalk of a frond; generally a small stalk.
stipella (stipel; plural stipellae): one of two small secondary stipules at the base of leaflets in some species.
Stipels - paired scales, spines, glands, or blade-like structures at the base of a petiolule
stipitate: stalked; borne on a stipe; of an ovary, borne on a gynophore
stipulate: bearing stipules.
stipule: small appendage at the bases of leaves in many dicotyledons.
Stipules: paired scales, spines, glands, or blade-like structures at the base of a petiole
Stipuloid: resembling stipules.
Stolon: A branch that forms near the base of the plant and grows horizontally and roots and produces new plants at the nodes or apex.
Stolon: a horizontally growing stem similar to a rhizome, produced near the base of the plant. They spread out above or along the soil surface, roots and new plants develop at the nodes or ends.
stolon: slender, prostrate or trailing stem, producing roots and sometimes erect shoots at its nodes. See also rhizome.
Stoloniferous: plants produce stolons.
stoloniferous: having stolons.
stoloniferous: a plant that produces stolons.
stoma (plural stomata): a pore; small hole in the surface of a leaf (or other aerial organ) allowing the exchange of gases between tissues and the atmosphere.
Stoma:
Stoma:
striate: striped with parallel, longitudinal lines or ridges.
strigose: covered with appressed, rigid, bristle-like, straight hairs; the appressed equivalent of hispid.
Strobilus:
strobilus (plural strobili): a cone-like structure consisting of sporophylls borne close together on an axis, for instance in some club-mosses, and other conifers.
Style:
stylodium: an elongate stigma that resembles a style, a false style, e.g. commonly found in Poaceae and Asteraceae.
stylulus: the elongated apex of a free carpel which functions like the style of a syncarpous ovary, allowing pollen tubes from its stigma to enter the locule of only that carpel.
Suberose: Having a corky texture.
subgenus: the category of supplementary taxa intermediate between genus and section. It is a singular noun, always has a capital initial letter and is used in combination with the generic name; e.g. Primula subgenus Primula.
Submarginal:
Suboral:
subshrub: undershrub; small shrub which may have partially herbaceous stems, but generally a woody plant less than 1 m high.
subspecies: a grouping within a species, usually used for geographically isolated and morphologically distinct entities. Its taxonomic rank occurs between species and variety.
subtend: to stand beneath or close to, as in a bract at the base of a flower.
Subulate (subulata): Awl-shaped with a tapering point
subulate: narrow and tapering gradually to a fine point.
succulent: juicy, fleshy; a plant with a fleshy habit.
Suffrutescent: somewhat shrubby, or shrubby at the base.
sulcate: furrowed; grooved.
superficial: on the surface.
Superior:
superior: of an ovary, borne above the level of attachment of the other floral parts, or above the base of a floral tube (that is, one that is free from the ovary and bears the perianth and stamens); compare inferior, half-inferior.
suspended: of an ovule, when attached slightly below the summit of the ovary; compare pendulous.
suture: a junction or seam of union. (see fissure, commissure)
Suture: the seam along which the fruit opens, normally in most fruits it is were the carpel or carpels are fused together.
sward: extensive, more or less even cover of a surface, for example a lawn grass; compare tussock.
Sword-shaped (ensiformis): Long, thin, pointed
sympatric: with more or less similar or overlapping ranges of distribution.
syn- (sym-): with, together.
synangium: a fused aggregate of sporangia.
Synanthamous:
Syncarpous: the gynoecium comprises one pistil.
syncarpous: of a gynoecium, made up of united carpels.
Synergid:
Syngenesious: the anthers are united into a tube, the filaments are free.
Synoicous: Male and female sex organs on the same gametophyte but are not clustered
synonym: outdated name or 'alternative' name for the same taxon.

T

Tap: a primary root that more or less enlarges and grows downward into the soil.
Tapetum:
taproot: the main, descending root of a plant with a single dominant root axis.
taxon (plural taxa): a group or category in a system of classification, derived from the Greek prefixes taxo-, taxis- meaning arrangement.
taxonomy: the study of the principles and practice of classification.
Tegmen:
Tendril: a thigmotropic organ which attached a climbing plant to a support, a portion of a stem or leaf modified to serve as a holdfast to other objects.
tendril: a slender organ (modified e.g. from stem, leaf, leaflet or stipule) used by climbing plants to cling to an object.
Tepal:
tepal: perianth segment, either sepal or petal; usually used when all perianth segments are similar in appearance; cf. petal.
terete: circular in cross-section; more or less cylindrical.
terminal: situated at the tip or apex.
ternate: in groups of three; of leaves, arranged in whorls of three; of a single leaf, with the leaflets arranged in groups of three. See Leaf shape.
terrestrial: generally denotes of or on the ground; of habitat, on land as opposed to in water (aquatic) or on rocks (lithophytic), or other plants (epiphytic), and so on.
testa: seed coat.
Testa:
tetrad: a group of four; usually means four pollen grains remaining fused together a maturity, e.g. in the Epacridaceae. Beach, Chandler B., ed. (1914). The New Student's Reference Work. Chicago: F. E. Compton and Co. {{cite encyclopedia}}: Missing or empty |title= (help)
Tetradynamous:
tetraspore: the asexual spore of red algae. It is so named because each sporangium produces just four spores. See Rhodophyceae. Beach, Chandler B., ed. (1914). The New Student's Reference Work. Chicago: F. E. Compton and Co. {{cite encyclopedia}}: Missing or empty |title= (help)

a thin flange of tissue extending beyond the normal outline of a structure, e.g. on the column of some orchids, on stems, on petioles;

Thorn:
thorn: a sharp, stiff point, usually a modified stem, that cannot be detached without tearing the subtending tissue; a spine; cf. prickle.
throat: the opening of a corolla or perianth.
thyrse: a branched inflorescence in which the main axis is indeterminate (racemose) and the lateral branches determinate (cymose).
Tiller:

Duration of individual plant lives are described using these terms:

tomentum (adjective tomentose): a dense covering of short, matted hairs. Tomentose is often used as a general term for bearing an indumentum, but this is not a recommended use.
toothed: with a more or less regularly incised margin.
torus: see receptacle.
Trabecula:
trademark (trade mark): a distinctive word, picture, symbol, smell or other device or any combination or multiples of these. It must not be descriptive of the goods or services, nor can it be geographical nor a surname. Used to distinguish one trader from another, compared with PBR which protect the commercial name of a particular plant variety.
Translator: a structure uniting the pollinia in Asclepiadaceae and Orchidaceae.
trapeziform: (1) like a trapezium (a four-sided figure with two parallel sides of unequal length); (2) like a trapezoid (a four-sided figure, or quadrilateral, with neither pair of sides equal); sometimes used erroneously as a synonym for rhombic.
tree: a woody plant, usually with a single distinct trunk and generally more than 5 m tall.
triad: a group of three.
triangular: planar and with 3 sides.
tribe: a taxonomic grouping, in rank between genus and species.
trichome: in non-filamentous plants, any hair-like outgrowth from epidermis, e.g. a hair or bristle; sometimes restricted to unbranched epidermal outgrowths.
Trifoliate, ternate (or trifoliolate) (trifoliata): Divided into three leaflets
trifoliolate (or trifoliate): a compound leaf of three leaflets, for example a clover leaf.
trigonous: triangular in cross-section and obtusely angled; cf. triquetus.
trinerved: having three nerves or veins.
Trinucleate: pollen containing three nuclei when shed.
Tripinnate (tripinnata): Pinnately compound in which each leaflet is itself bipinnate
triplinerved: (of leaves) having three main nerves with the lateral nerves arising from the midnerve above the base of the leaf.
Triploid:
triquetrous: more or less triangular in cross-section, but acutely angled (with 3 distinct longitudinal ridges); cf. trigonus.
trivial name: the second word in the two-part scientific name of an organism; cf. specific epithet.
trullate: ovate but angled; like a brick-layers trowel; inverse kite-shaped; compare rhombic.
Truncate (truncata): With a squared off end
truncate: cut off squarely; with an abruptly transverse end.
trunk: the upright large main stem of a tree.
truss: a compact cluster of flowers or fruits arising from one centre; for instance, evident in many rhododendrons.

Fruits are divided into different types depending on how they form, were or how they open and what parts they are composed of. Fruits are the matured ovary of seed bearing plants and they include the contents of the ovary, which can be floral parts like the receptacle, involucre, calyx and others that are fused to it. Fruits are often used to identify plant taxa and help to place the species in the correct family or differentiate different groups with in the same family.

Tuber:
tuber: an underground storage organ formed by the swelling of an underground stem which produces buds and stores food, forming a seasonal perennating organ, for example potato; compare tuberoid.
Tuber]]ous: roots that are thick and soft, with storage tissue. Typically thick round in shape.
tubercle: a small wart-like outgrowth.
tuberculate: covered in tubercles; warty.
tuberoid: an underground storage organ formed by the swelling of a root; occurs in many orchids.
tuberous: resembling a tuber; producing tubers.
tubular: with the form of a tube or cylinder.
tunic: outer covering of some bulbs and corms.
turbinate: top-shaped.
Turgid: swollen.
turgid: swollen with liquid; firm; compare flaccid.
tussock: a dense tuft of vegetation, usually well separated from neighbouring tussocks, for example some grasses; compare sward.
Twigs:
two-ranked: having leaves arranged in two rows in the same plane, on opposite sides of the branch; = distichous.
type: an item (usually a herbarium specimen) to which the name of a taxon is permanently attached, i.e. a designated representative of a plant name. Important in determining the priority of names available for a particular taxon.
type genus: in nomenclature, the genus from which the family is based.
typography: the presentation of printed matter, covering issues such as type styles (e.g. italic or roman type), underlining, emboldening and letter spacing.

U

umbel (adjective umbellate): a racemose inflorescence in which all the individual flower stalks arise in a cluster at the top of the peduncle and are of about equal length; in a simple umbel, each stalk is unbranched and bears only one flower; a cymose umbel is an apparent umbel but its flowers open centrifugally.
Umbel: were the flower head has all the flower stalks rising from the same point of the same length, the flower head is rounded like an umbrella or almost circular.
umbonate: with a conical projection arising from a flatter surface.
uncinate: with a hook at the apex.
undershrub: a low shrub, often with flowering branches that die off in winter; cf. subshrub.
undulate: wavy and not flat; compare sinuate.
Unicarpellate:
Unifoliate (unifoliata): with a single leaf
unilocular: having one loculus or chamber, e.g., the ovary in the families Proteaceae and Fabaceae.
Unisexual:
unisexual: of one sex; bearing only male or only female reproductive organs.
unitegmic: (of an ovule), covered by a single integument.
Upright: Growing upward.

Duration of leaves:

urceolate: urn-shaped.
Utricle: a small inflated fruit with one seed that has thin walls,
utricle: a small bladder; a membranous bladder-like sac enclosing an ovary or fruit; in sedges a fruit in which the pericarp is larger than, and loosely encloses, the seed.

V

Valvate: meeting along the margins but not overlapping.
valvate: of sepals and petals in bud, which meet edge to edge but do not overlap.
Valve:
Valve: one of the segments of the capsule.
valve: a portion of an organ that fragments or splits open, for example the teeth-like portions of a pericarp in a split (dehisced) capsule.
Valvular: anthers opening by valves or small flaps, e.g. Berberis.
var.: see varietas.
variant: a plant or group of plants showing some measure of difference from the characteristics associated with a particular taxon.
variegated: irregularly marked with blotches or patches of another colour.
varietas (variety in common usage, abbreviated as var.): (Latin) in the Linnean hierarchy a rank below that of species, between the ranks of subspecies and form.
Vascular bundles: a strand of woody fibers and associated tissues.
Vegetative: buds containing embryonic leaves.
Vein: the externally visible vascular bundles, found on leafs, petals and other parts.
Veinlet: a small vein.
veinlet: a small vein; the ultimate (visible) division of a vein.
velvety: densely covered with fine, short, soft, erect hairs.
venation: the arrangement of veins in a leaf.
ventral: the front; in particular, towards the axis in a lateral organ or towards substratum in prostrate plant; compare dorsal.
Vernation: the arrangement of leaves, petals or sepals in an unopened bud.
vernation: the arrangement of unexpanded leaves in a bud; the order of unfolding of leaves from a bud.
Verrucose: with a wart surface, with low rounded bumps.
verrucose: with warts.
Versatile: anthers pivoting freely on the filament.
versatile: of anthers, swinging freely about the point of attachment to the filament.
Verticil: a whorl of leaves or flowers.
Verticil: flowers arranged in whorls at the nodes.
Verticillaster: a whorled collection of flowers around the stem, the flowers produced in rings at intervals up the stem. As the stem tip continues to grow more whorls of flowers are produced. Typical in Lamiaceae.
Verticillate: arranged in whorls.
verticillate: arranged in one or more whorls.
vescicular: of hairs, bladder-like; vesciculous, bearing such hairs.
vessel: a capillary tube formed from a series of open-ended cells in the water-conducting tissue of a plant.
vestigial: reduced in form and function from the normal or ancestral condition.
Villose: covered with fine long hairs that are not matted.
Villosity: villous indument.
villous: covered with long, soft, weak hairs, the covering somewhat dense.
Virgate: wand-like, slender erect growing stem with many leaves or very short branches.
viscid: sticky; coated with a thick, syrupy secretion.
viviparous: (1) seeds or fruits which germinate before being shed from the parent plant, (2) the development of plantlets on non-floral organs e.g. leaves.

W

warty: a surface covered with small round protuberances, especially in fruit, leaves, twigs and bark, see tuberculate.
watershoot: an erect strong-growing or epicormic shoot developing from near the base of a shrub or tree, but distinct from a sucker.
weed: loosely defined as a plant growing where it is not wanted; commonly associated with disrupted habitats; (1) agricultural weed: a plant which taints produce or pollutes crops; (2) environmental weed: naturalised, exotic or ecologically 'out-of-balance' indigenous species outside the agricultural or garden context which, as a result of invasion, adversely affects the survival or regeneration of indigenous species in natural or partly-natural vegetation communities (Carr, G.W., in Foreman & Walsh, 1993).
whorl: a ring of organs borne at the same level on an axis, for example leaves, bracts or floral parts.
Whorl: three or more leaves or branches or pedicels arising from the same node.
Whorled: said of a collection of three or more leaves or flowers that arise from the same point.
terminal: situated at the tip or apex.
scion: the aerial part of a graft combination, induced by various means to unite with a compatible understock/roostock.
wild: originating from a known wild habitat (wilderness). See Wildlife.
wing:
Wing: any flat surfaced structure emerging from the side or summit of an organ; seeds, stems.
Wing: term used for the lateral petals of the flowers on species in Fabaceae and Polygalaceae.
Woody: forming secondary growth laterally around the plant so as to form wood.
Woody perennial: true shrubs and trees or some vines with shoot systems that remain alive above the soil surface from one year to the next.
woolly: very densely covered with long, more or less matted or intertwined hairs, resembling sheep's wool.

X

Xenia:
xeromorph: a plant with structural features (e.g. hard or succulent leaves) or functional adaptations that prevent water loss by evaporation; usually associated with arid habitats, but not necessarily drought-tolerant; cf. xerophyte.
xerophyte: a plant generally living in a dry habitat, typically showing xeromorphic or succulent adaptation; a plant able to tolerate long periods of drought; cf. xeromorph.

Y

Z

Zygomorphic: one axis of symmetry running down the middle of the flower so the right and left halves reflect each other.
zygomorphic: bilaterally symmetrical; symmetrical about one vertical plane only; applies to flowers in which the perianth segments within each whorl vary in size and shape; compare actinomorphic, irregular.
Zygomorphy: the type of symmetry that most irregular flowers have with the upper half of the flower unlike the lower half. the left and right halves tend to be mirror images of each other.
Zygote:
zygote: a fertilized cell.

Notes

^ a b The distinction between acerose, acicular and #subulate is not clear. Beentje (Kew Pl. Glos., 2010:6) states that acerose organs are both #terete (cylindrical) and #subulate, whereas acicular leaves may have a cross-section of any shape.
^ actinostele refers to the shape, #protostele refers to its evolutionary level.
^ a b The distinction between these various tapering shapes ("acuminate", "attenuate", "caudate", "cuspidate") is not entirely clear and sometimes conflicting. Cf. Rickett Bull. Torrey Bot. Club. 83(5):342-354, 1956.
^ a b c d e f In describing shape, the apex and base are not always considered to change the shape of the overall organ: for example a leaf can be #ovate and still have an acuminate tip; it can even be #orbicular and still have an acute apex and base!
^ a b More elaborate terminology have been proposed (e.g. Simpson, Pl. Syst., 2006:442-446), but these four terms are the most commonly used. According to Beentje (Kew Pl. Glos., 2010:9), "amphitropous" and "#campylotropous", but most author draw a distinction.
^ The sum of the floral parts proper and the glumes is also commonly referred to as a "floret", as it constitute the unit in a #spikelet.
^ Not to be confused with #introrse and #extrorse.
^ In practice these three terms are very poorly separated in most reference works. Cf. Rickett Bull. Torrey Bot. Club. 83(5):342-354, 1956.
^ a b An #arista and an #awn are mostly the same thing differentiated by the organ and the type of plant bearing them.

[acerose-acicular-1] The distinction between acerose, acicular and #subulate is not clear. Beentje (Kew Pl. Glos., 2010:6) states that acerose organs are both #terete (cylindrical) and #subulate, whereas acicular leaves may have a cross-section of any shape.

[2] tinostele refers to the shape, #protostele refers to its evolutionary level.

[acuminate-syns-3] The distinction between these various tapering shapes ("acuminate", "attenuate", "caudate", "cuspidate") is not entirely clear and sometimes conflicting. Cf. Rickett Bull. Torrey Bot. Club. 83(5):342-354, 1956.

[apex-base-4] In describing shape, the apex and base are not always considered to change the shape of the overall organ: for example a leaf can be #ovate and still have an acuminate tip; it can even be #orbicular and still have an acute apex and base!

[ovule-position-5] More elaborate terminology have been proposed (e.g. Simpson, Pl. Syst., 2006:442-446), but these four terms are the most commonly used. According to Beentje (Kew Pl. Glos., 2010:9), "amphitropous" and "#campylotropous", but most author draw a distinction.

[6] The sum of the floral parts proper and the glumes is also commonly referred to as a "floret", as it constitute the unit in a #spikelet.

[antrorse-retrorse-7] Not to be confused with #introrse and #extrorse.

[apiculate-cuspidate-mucronate-8] In practice these three terms are very poorly separated in most reference works. Cf. Rickett Bull. Torrey Bot. Club. 83(5):342-354, 1956.

[arista-awn-9] An #arista and an #awn are mostly the same thing differentiated by the organ and the type of plant bearing them.