A large family, most of them tropical; herbs, shrubs, or trees; leaves alternate, generally compound, usually with two or three leaflets; flowers small, regular and perfect, in clusters; calyx with three to six lobes or teeth; petals of the same number, separate, or more or less united, neither sepals nor petals overlapping in the bud; stamens as many as the petals, or twice as many, or numerous, separate or united; ovary superior; fruit a pod.