藏南黄耆 zang nan huang qi

Plants up to 30 cm, vegetative parts covered with subap­pressed to ascending, often flexuous, white hairs 0.5-1.5 mm. Stems ± erect, loosely to rather densely hairy. Leaves 4-8 cm, subsessile; stipules 6-9 mm, lower ones behind stem distinctly connate, loosely hairy; rachis hairy like stem; leaflets in 12-15 pairs, narrowly elliptic to elliptic, 5-14 × 1.5-7 mm, abaxially loosely to rather densely hairy, adaxially glabrous or subgla­brous to sparsely hairy, apex acute to obtuse. Racemes 2-5 cm, rather loosely many flowered; peduncle 2-7 cm, hairy like stem but mostly also with black hairs toward raceme; bracts 3-4 mm, predominantly white but also black hairy. Calyx 4-5 mm, rather densely covered with subappressed to ascending white hairs 0.5-1 mm and with mostly somewhat shorter black hairs; teeth 1.5-3 mm. Petals blue-violet; standard widely elliptic to subor­bicular, 7-8(-9) × 5-6(-7) mm; wings 5.5-7(-8) mm; keel 5-6(-7) mm. Legumes subsessile, obliquely ellipsoid, curved, 6-7 mm, 2-2.5 mm high and wide, keeled ventrally, flattened to shallowly grooved dorsally, acute, often with hooked persistent style, 1-locular; valves rather densely covered with ascending white or white and black hairs up to 0.8 mm.

● 3400-5100 m. Qinghai, Xizang.

The Chinese record of Astragalus leucocephalus Graham ex Bentham (FRPS 42(1): 220. 1993) is referable to A. austrotibetanus.