Trees, small, or shrubs, ca. 3 m tall, armed with recurved prickles at internodes. Bark brown or grayish, often split. Young branchlets pubescent, glabrescent. Leaf gland at middle part of petiole, soon deciduous or without gland; pinnae 7-13 pairs, 7-12 cm or longer, pubescent; leaflets 20-40 pairs, obliquely lan­ceolate or linear-lanceolate, 4-8 mm, sparsely sericeous when young, margin ciliate, midvein oblique, apex acute or slightly acute. Heads ca. 1 cm in diam., 2-6 in axillary or terminal panicles; peduncles 2-4 cm, villous. Flowers puberulent or sub­glabrous. Calyx ca. 2 mm. Corolla ca. 3 mm. Filaments ca. 5 mm. Ovary glabrous. Legume oblong, 8-10 × 2.5-3 cm. Fl. May-Jun, fr. Jan of following year.

● Forests; 800-1500 m. Sichuan, Yunnan.