Keel petal much shorter than the vexillum (anthers uniform)
Keel petal longer than or equal to the vexillum
Anthers uniform (vexillum as long as the keel petals; fruit 2-valved and 1-seeded at the top, seedless below)
Anthers dimorphic, alternately dorsifixed and basifixed, the shorter often broader (fruit often with stinging hairs, 2-valved)
Butea Konig ex Roxb.Erythrina Linn.Mucuna Adans.
Stizolobim P.Br. = Mucuna Adans.