Description from Flora of China
Herbs, annual or short-lived perennial, erect to ascending, 0.5-1 m tall. Stems terete, densely silky pubescent. Stipules minute, caducous. Leaves simple; petiole short; leaf blade linear to oblong, 2-5 × 0.3-1.5 cm, both surfaces silky pilose, adaxially sometimes only along midvein, base cuneate to rounded, apex acuminate to obtuse and mucronate. Racemes terminal, lax, 10-20 cm, many flowered; bracts lanceolate, 2-3 mm. Pedicel to 2.5 mm; bracteoles inserted at base of calyx, similar to bracts. Calyx 2-lipped, 6-7 mm, deeply divided, densely rusty pilose; abaxial lobes lanceolate; adaxial lobes slightly longer and broader. Corolla yellow with darker veins; standard oblong to suborbicular, 5-7 mm, margin pilose at base and with 2 appendages, apex retuse; wings oblong, 6-7 mm; keel ca. 8 mm, ± sharply angled near base, margins minutely woolly, apex extended into a long straight twisted beak. Legume rhombic to ovoid, 5-6 mm, 8-10-seeded, glabrous; stipe almost absent. Fl. Aug-Oct, fr. Nov-Dec.
Slopes, seashore sandy areas, along trails; 400-2500 m. Guangdong, Guangxi, Guizhou, Hainan, Hunan, Sichuan, Taiwan, Xizang, Yunnan [India, Japan (Ryukyu Islands), Myanmar, Sri Lanka].