List of endemic flora of Puerto Rico

^ a b "There has much disagreement with respect to the number of Zamia species recognized in Puerto Rico and the West Indies. In a detailed study of leaf morphology, based on herbarium species, Eckenwalder (1980) found a continuous gradation in foliar characteristics throughout the West Indies, concluding that Zamia was represented in the West Indies by two subspecies of Z. pumila. Accordingly, all native populations in Puerto Rico are Z. pumila ssp. pumila. A contrasting view is presented by Stephenson (1987) where four species are recognized in Puerto Rico based on foliar and strobili characters desrived from herbarium specimens and live plants. For the most part..., the present authors follow Stephenson's opinion, realising that further work is needed (DNA sequencing) in order to confirm or reject his assessment." Acevedo-Rodriguez, P. and M.T. Strong. 2005. Zamiaceae. In Acevedo-Rodriguez, P. and M.T. Strong (eds.) Monocotyledons and Gymnosperms of Puerto Rico and the Virgin Islands. Contributions from the United States National Herbarium volume 52.

References

^ Known only from the summit of Cerro Mariquita in the Sierra Bermeja. [1].
^ Known only from the summit of Cerro Mariquita in the Sierra Bermeja. [2].
^ Francis, John K. and Lowe, Carol A. 2000. Bioecología de Arboles Nativos y Exóticos de Puerto Rico y los Indias Occidentales. USDA Forest Service International Institute of Tropical Forestry General Technical Report IITF-15
^ Calliandra locoensis
^ Puerto Rico's national flower.
^ The records for this species are questionable
^ This species was formerly classified as Clidemia portoricensis and Clidemia pusilliflora.
^ A federally listed endangered species. [3]
^ a b c d e Ackerman, James D. (30 June 1995). "An orchid flors of Puerto Rico and the Virgin Islands". Memoirs of the New York Botanical Garden. 73.
^ A federally listed endangered species.
^ Formerly Encylcis krugii and Epidendrum krugii
^ Lioger & Martorell, 2000, Flora of Puerfto Rico and adjacent islands: a systematic synopsis, 2nd ed., Edit. Univ. Puerto Rico, San Juan, Puerto Rico
^ Luer, C. A. 2002. Selbyana 23: 22. Formerly known as Lepanthes veleziana var. retusicolumna
^ Known only from two sites in southwestern Puerto Rico
^ Known from only two locations in southwestern Puerto Rico
^ Known only from a single site at the Guánica Commonwealth Forest. [4]
^ Román Guzmán, Javier A. 2006. A study of Randia portoricensis (Urb.) Britton & Standley [Rubiaceae]: A rare species. MS Thesis, University of Puerto Rico, Mayagüez

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