Description from Flora of China
Herbs, ascending, 20-80 cm tall. Branches densely brown spreading silky pilose. Stipules linear, 2-4 mm. Leaves simple; petiole short; leaf blade suborbicular to oblong, 1-2(-3) × 1-1.5 cm, membranous to papery, both surfaces sparsely white spreading silky pilose, base narrow to slightly cordate, apex obtuse to acuminate. Racemes terminal, 5-30-flowered; bracts lanceolate to acicular, 2-3 mm. Pedicel 3-5 mm; bracteoles inserted at base of calyx tube or on apical part of pedicel, acicular. Calyx 2-lipped, 4-6 mm, parted to base, densely brown silky pilose; lobes lanceolate. Corolla yellow; standard suborbicular to obovate, 4-5 mm; wings narrowly elliptic, slightly shorter than standard; keel suborbicular, apex with a long twisted beak. Ovary subsessile. Legume cylindric, ca. 1 cm, 10-12-seeded, glabrous. Fl. Aug-Nov, fr. Dec-Feb.
Along trails, thickets on slopes; 100-1700 m. Hainan, Taiwan, Yunnan [Bangladesh, Cambodia, India, Indonesia, Laos, Myanmar, Nepal, Philippines, Thailand, Vietnam; Australia].