Vachellia macracantha (Porknut) is a species of tree in the family Fabaceae. It has a self-supporting growth form. It is native to Puerto Rico, the contiguous United States, and U.S. Virgin Islands. Vachellia macracantha has compound, broad leaves. Flowers are visited by Xylocopa. Vachellia macracantha fixes nitrogen. It is a photoautotroph. Individuals can grow to 7 m.
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