小叶棘豆 xiao ye ji dou

Phaca microphylla Pallas, Reise Russ. Reich. 3: 744. 1776; Astragalus microphyllus (Pallas) Pallas (1802), not Linnaeus (1753); Oxytropis chiliophylla Royle ex Bentham; O. grenardii Franchet; O. ingrata Freyn; O. polyadenia Freyn; O. tibetica Bunge.

Herbs, (4-)5-15 cm tall, acaulescent, from a multiheaded caudex. Branches conspicuously white villous-pilose, with per­sistent stipules at base. Stipules narrowly triangular, ca. 5 × 1.5 mm, membranous, densely yellowish villous or with spreading to ascending whitish trichomes and with glands, basally con­nate. Leaves (2-)4-6(-7) cm; leaflets verticillate, in (10-)13-27 whorls; leaflet blades lanceolate-ovate to narrowly elliptic, 2-3 × 0.5-1 mm. Racemes compact to rather lax, becoming 2-5 cm, 3-6-flowered; peduncle 2-5(-7) cm, shorter to longer than leaves, densely villous and with glands; bracts triangular, 7-8 × 2-3 mm, villous and with glands. Calyx cylindric, 9-10 × ca. 3 mm, whitish and blackish villous and with glands; lobes sub­ulate, 2-2.7 × ca. 0.5 mm. Corolla purple, pink, bluish purple, light bluish violet, violet, yellow, or white; standard 1.9-2 cm, lamina elliptic, apex rounded; wings 1.5-1.7 cm, lamina obo­vate, apex retuse; keel 1.3-1.5 cm, beak 1-1.6(-2) mm. Leg­ume sessile or subsessile; body falcate-oblong in profile, (1.2-)1.7-3 × 0.5-0.7 cm, erect-ascending, abaxially deeply sul­cate, whitish and blackish villous or glabrous and tubercular-glandular. Fl. May-Sep, fr. Jul-Sep. 2n = 16, 16 + 2B.

Hillsides, valley slopes, gravelly river terraces, hillsides in Stipa grasslands, ice terraces, high-elevation grasslands, Carex-Arenaria com­munities in stony open limestone areas, sandy areas, Caragana scrub; 2700-5200 m. Gansu, Nei Mongol, Qinghai, Xinjiang, Xizang [Af­ghanistan, India, Kashmir, Kyrgyzstan, Nepal, Pakistan, Tajikistan].