缘毛棘豆 yuan mao ji dou

Herbs, 5-20 cm tall, acaulescent, from a multiheaded cau­dex, clothed with marcescent leaf bases and stipules. Stipules broadly ovate, membranous, with dense white or yellow long trichomes on surface and margin, basally adnate to petiole. Leaves 5-15 cm, 9-17-foliolate; rachis slightly flattened; leaflet blades linear-oblong, oblong, linear-lanceolate, or oblanceolate, 5-10 × 2-6 mm, both surfaces glabrous, base cuneate, margin long ciliate, apex acute to obtuse. Racemes rather lax, 2-8-flow­ered; peduncle shorter than to as long as leaves, incurved to erect. Calyx cylindric, 1.2-1.3 cm, with sparse trichomes; lobes lanceolate-attenuate, 2.5-3 mm, ca. 1/3 as long as tube. Corolla pale yellow; standard 2-2.6 cm, lamina elliptic, apex rounded; wings 2-2.8 cm, as long as standard, apex truncate to obtuse; keel ca. 2 cm, shorter than wings, beak 1.5-2 mm. Legume sessile, dark brown to yellowish brown, ovoid, 2-2.5 × 1.2-1.5 cm, inflated, membranous, glabrous, apex beaked. Fl. May-Jun, fr. Jun-Jul.

Roadsides, hilly sunny slopes, valleys, scrub in Betula forests; 1800-1900 m. Hebei, Nei Mongol, Ningxia [Mongolia].