Description from Flora of China
Guilandina Linnaeus; Mezonevron Desfontaines.
Trees, shrubs, or climbers, usually with prickles. Leaves alternate, bipinnate; leaflets alternate or opposite, small or large. Inflorescences racemes or panicles, axillary or terminal. Flowers yellow or orange-yellow, medium-large or large. Receptacle concave. Sepals separate, imbricate, lowest one larger. Petals 5, often clawed, spreading, 4 usually orbicular, sometimes oblong, uppermost smaller, different in color, shape, and pubescence from others. Stamens 10, in 2 whorls; filaments thickened and hairy at bases; anthers ovoid or elliptic, dorsifixed and versatile. Ovary 1-7-ovuled; style terete; stigma truncate or hollow at center. Legume compressed or swollen, ovoid, oblong, or lanceolate, sometimes falcate, winged or not, smooth or spiny, leathery or woody, rarely fleshy, dehiscent or indehiscent. Seeds ovoid or globose; albumen absent.
About 100 species: pantropical distribution; 20 species (six endemic, two introduced) in China.
(Authors: Chen Dezhao (陈德昭 Chen Te-chao), Zhang Dianxiang (张奠湘); Ding Hou)