Description from Flora of China
Trees, buttressed, to 50 m tall or more, unarmed. Leaves alternate, abruptly bipinnate; pinnae opposite; leaflets opposite, petiolulate. Inflorescences racemes, solitary in axils of leaves, or 2 or 3 at apices of short branches; bracts and bracteoles caducous, small. Flowers hermaphroditic. Receptacle campanulate. Sepals 5, subequal, imbricate. Petals 5, equal in size, ca. 2 × as long as sepals. Stamens 5; filaments straight and much more exserted from corolla; anthers dorsifixed, opening by lateral slits. Ovary stalked; ovules numerous; style incurved, short; stigma terminal, small. Legume long stipitate, compressed, strap-shaped, narrowly winged along ventral suture. Seeds numerous, flat, obovoid, with endosperm.
About two species: S and SE Asia; one species in China.
(Authors: Chen Dezhao (陈德昭 Chen Te-chao), Zhang Dianxiang (张奠湘); Ding Hou)