Description from Flora of China
Mezonevron cucullatum (Roxburgh) Wight & Arnott.
Climbers, 3-5 m tall, with recurved prickles on old stems forming compressed orbicular corky knob. Branches and rachis of leaves with blackish brown recurved prickles. Leaf rachis 20-40 cm; pinnae 2-5 pairs, stalked; stipules absent; leaflets 3-6 pairs, abaxially grayish white, adaxially deep green and shiny, ovate, broadly ovate, or oblong, large, 4-12 × 2.5-5 cm, leathery, base broadly cuneate or obtuse-rounded, apex acuminate. Panicles terminal or racemes lateral, subequal to leaves in length. Flowers zygomorphic; pedicels 6-12 mm, jointed, glabrous. Receptacle deeply discoid or shallowly campanulate. Sepals 5, unequal, lowest one cucullate, others triangular-oblong, withered and falling after anthesis. Petals yellow, uppermost one short and broad, apex 2-lobed forming fishtail-shape, shortly clawed at base, other 4 yellowish tinged red striate, shiny, oblong, glabrous. Stamens 10, exserted, slightly thickened at base, brown pubescent. Ovary compressed, 1(or 2)-ovuled; style slender; stigma small, truncate. Legume reddish brown, shiny, compressed, elliptic-oblong, 8-12 × 2.5-3.5 cm, indehiscent, winged along ventral suture, wing 6-9 mm wide. Seed 1(or 2). Fl. Nov-Feb, fr. Mar-Oct.
Open forests, among bushes on mountain slopes; 500-1200 m. Yunnan [Bhutan, India, Indonesia, Laos, Malaysia, Myanmar, Nepal, Thailand, Vietnam].