Description from Flora of China
Crotalaria anagyroides Kunth.
Herbs or shrublets, to 2 m tall. Stems terete, thick, densely rusty appressed pubescent. Stipules acicular, very minute, persistent or caducous. Leaves 3-foliolate; petiole 2-5 cm; petiolules ca. 2 mm; leaflet blades elliptic to narrowly elliptic, 4-7(-10) × 2-3 cm, terminal one larger than lateral ones, thin, veins distinct on both surfaces, midvein abaxially sparsely pilose and adaxially pilose, secondary veins 8-15 on each side of midvein, base cuneate, apex acuminate and mucronate. Racemes terminal, 10-30 cm, 20-30-flowered; bracts linear, 0.7-1.3 cm, caducous. Pedicel 5-7 mm; bracteoles similar to bracts but smaller. Calyx subcampanulate, 7-10 mm, 5-lobed, densely rusty silky pilose; lobes broadly lanceolate, ± as long as tube. Corolla yellow, exserted beyond calyx; standard orbicular, ca. 1.4 cm in diam., base with 2 appendages, apex obtuse to retuse; wings oblong, ca. 1.3 cm; keel ca. 1 cm, abruptly rounded slightly below middle, beak slightly incurved. Legume oblong, 2.5-4 × 1-1.5 cm, 20-30-seeded, densely pilose when young, glabrescent; stipe 2-4 mm. Seeds black when mature, obliquely cordate, nearly smooth. Fl. May-Sep, fr. Aug-Dec.
Grasslands, slopes, along trails; below 100-2400 m. Cultivated or naturalized in Fujian, Guangdong, Guangxi, Hainan, Taiwan, and Yunnan [native to South America and Mexico].