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.

[2] This tree is endemic to Mexico.

This Mimosoideae-related article is a stub.