Description from
Flora of China
Trees, unarmed. Leaves large, abruptly bipinnate, stipulate; pinnae many pairs; leaflets numerous, small. Inflorescences corymbose racemes, terminal. Flowers bisexual, white, orange, or red, large, showy. Bracts caducous, small. Receptacle discoid or turbinate. Sepals 5, obovate, subequal, valvate. Petals 5, alternating with sepals, orbicular, margin crispate, clawed. Stamens 10, free, declined. Ovary sessile; ovules numerous; style filiform; stigma truncate. Legume pendulous, compressed, strap-shaped, 2-valved; valves thickly woody, hard. Seeds transverse, oblong.
Two or three species: from E Africa and Madagascar to tropical Asia; one species (introduced) in China.
(Authors: Chen Dezhao (陈德昭 Chen Te-chao), Zhang Dianxiang (张奠湘); Kai Larsen, Supee Saksuwan Larsen)