Vachellia sphaerocephala, the bull's horn thorn or bee wattle, is a plant species in the family Fabaceae. The name comes from the shape of the thorns which do indeed resemble the horns of a bull. The tree has a strong, symbiotic relationship with a species of stinging ant, Pseudomyrmex ferruginea.Whitney. H.M. and B.J. Glover. 2007. Coevolution: Plant–Insect. Encyclopedia of Life Sciences, 1–7 This tree is endemic to Mexico.Encyclopedia of Life
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