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The swellings are domatia housing myrmecophile ants which protect the tree. An eastern Africa species, also known as Swollen Thorn and placed in the Vachellia genus by some. Photo from Songea region, Tanzania.
Date
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Acacia drepanolobium-- Whistling Thorn
Author
Dick Culbert from Gibsons, B.C., Canada
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This image was originally posted to Flickr by Dick Culbert at https://flickr.com/photos/92252798@N07/25396927222. It was reviewed on 10 July 2016 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.
10 July 2016
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author name string: Dick Culbert
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4 March 2016
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