秦岭棘豆 qin ling ji dou

Oxytropis humilis C. W. Chang.

Herbs, 8-12 cm tall, caulescent, arising from a multi­headed caudex, tuft-forming. Stems slender, prostrate or some­times ascending, with 1 or more apparent internodes. Stipules lanceolate, 5-8 mm, abaxially pubescent, margin ciliate, apex acuminate. Leaves ca. 8 cm, (17 or)19- or 21-foliolate; petiole and rachis slender, sparsely pubescent; leaflet blades ovate to ovate-lanceolate, 5-10 × 3-4.5 mm, midvein with trichomes, base cuneate to rounded, apex acute to rounded. Racemes com­pact, (4-)6-8-flowered; peduncle 7-11 cm, sparsely pubescent; bracts lanceolate, 3-5 mm, herbaceous, abaxially pubescent. Calyx campanulate, ca. 4 × 3 mm; lobes lanceolate, ca. 2 mm, densely black strigose. Corolla color unknown; standard ca. 1.2 × 0.8 cm, lamina broadly ovate, apex emarginate; wings ca. 11 × 3 mm, lamina oblong, apex emarginate; keel ca. 1.1 cm, beak ca. 0.5 mm. Legume shortly stipitate; body oblong-cylindric, 9-13 × 4-5 mm, inflated, papery, with black trichomes, 1-locular, 8-12-seeded, adaxial suture slightly convex, apex acute, beak curved. Fl. May-Jul, fr. Jul-Aug.

● Sunny grasslands, meadows on sunny slopes; 1800-3900 m. Shaanxi, Xizang.