丝茎黄耆 si jing huang qi

Astragalus filicaulis subsp. rytilobus (Bunge) Popov; A. leptodermus Bunge; A. rytilobus Bunge.

Plant hairs white, at stipules and in inflorescence also black, 0.3-1.6 mm. Stems 8-27 cm, prostrate to erect, sparsely appressed hairy. Leaves 5-8 cm; stipules greenish, 2.5-4 mm, ciliate; petiole 0.5-1.2 cm, like rachis sparsely subappressed hairy; leaflets in 5-7 pairs, narrowly elliptic to narrowly ob­long, 2-13 × 1-2.8 mm, subappressed hairy, apex obtuse to slightly retuse. Racemes 3-9-flowered; peduncle 1.5-6 cm, appressed hairy; bracts hyaline, 1-1.5 mm, ciliate. Calyx cam­panulate, 3-4 mm, covered at base mainly with appressed white hairs, toward teeth with more spreading and more black hairs; teeth subulate, 1.8-2 mm. Petals violet; standard narrowly ellip­tic, 6-8 × 2-2.5 mm, apex widely retuse; wings 4.5-5 mm; keel 3.5-4 mm. Legumes stellately arranged or more deflexed, ob­long to narrowly ovoid, 6-10 mm, 3-4 mm high and wide, somewhat widened near base, with a short beak, incompletely 2-locular; valves thin, wrinkled, loosely covered with 2 kinds of hairs: short subappressed hairs 0.1-0.3 mm and long spreading hairs up to 1.5 mm.

Steppes, semideserts, in all kinds of soils; below 3200 m. Xinjiang [Afghanistan, Kazakhstan, Kyrgyzstan, Pakistan, Russia, Tajikistan, Turkmenistan, Uzbekistan; SW Asia (Iran)].