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FOC | Family List | FOC Vol. 10 | Fabaceae | Astragalus

226. Astragalus webbianus Graham ex Bentham in Royle, Ill. Bot. Himal. Mts. 199. 1835.

藏西黄耆 zang xi huang qi

Astragalus minutofoliolatus Wendelbo.

Plants subshrubby, acaulescent to shortly caulescent, with white hairs 0.3-0.7(-1) mm, inflorescence also with black hairs. Stems, if present, up to 5 cm. Leaves 8-22 cm; stipules distinctly longitudinally nerved, 10-15 mm, adnate to petiole for 3-5 mm, lower ones ciliate and often hairy at base, upper hairy, often connate around petiole for 1-3 mm; petiole 3-6 cm, like rachis sparsely to loosely covered with ascending hairs up to 1 mm, toward end of vegetation period hardening and often spiny, persistent to next year or even longer; leaflets in 17-23 pairs, elliptic to obovate, 2-9 × 1-4.5 mm, abaxially and at margins sparsely ± appressed hairy, adaxially glabrous, apex rounded to slightly retuse. Racemes 2-5-flowered; peduncles several, 0.5-1.5 cm, appressed hairy; bracts 8-10 mm, with white and also black hairs. Bracteoles often present, up to 2 mm. Calyx 15-17 mm, sparsely to rather densely covered with ascending white and blackish to black hairs; teeth 4-8 mm. Pet­als yellow; standard obovate, 24-27 × 9-11 mm, apex emar­ginate; wings 22-23 mm; keel 19-21 mm. Legumes with a stipe 3-4 mm, 20-25 mm, 5-6 mm high and 8-10 mm wide, nar­rowly grooved ventrally and dorsally, with a straight beak 3-4 mm, 2-locular; valves glabrous.

Moraines, among debris in alpine zone; 3600-5000 m. Xizang [Afghanistan, India, Kashmir, Pakistan].


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