窄翼黄耆 zhai yi huang qi

Astragalus degensis var. rockianus E. Peter; A. grubovii S. H. Cheng ex P. C. Li (1989), not Sanchir (1974); A. guan­shuanus P. C. Li; A. voburus Y. H. Xu & Q. R. Liu.

Plants 40-50(-100) cm tall, with appressed hairs 0.3-0.6(-1) mm. Stem sparsely to loosely covered with white and black or predominantly black hairs, glabrescent with age. Leaves 6-12 cm; stipules linear-subulate, 6-10 mm, spreading to reflexed, black ciliate; rachis sparsely to loosely covered with mostly black hairs; leaflets in 7-15 pairs, narrowly elliptic, 8-20(-30) × 3-8(-12) mm, abaxially ± light green and loosely appressed white hairy, adaxially dark green and glabrous, apex acute to slightly retuse with a distinct cusp ca. 0.5 mm. Ra­cemes ca. 3 cm, densely many flowered, at fruiting time elon­gated and up to 6(-12) cm; rachis loosely to densely black hairy; peduncle 5-20 cm, loosely to rather densely black hairy, glabrescent with age; bracts whitish, linear-subulate, 5-7 mm, black ciliate. Calyx shortly tubular, 6-9 mm, loosely covered with white and black or only black hairs; teeth subulate, 3-5 mm. Petals yellow to greenish yellow or purplish, yellow when dry; standard oblong to elliptic, 11-13(-15) × 4-7 mm, rounded at apex; wings 10-11(-13) mm; keel 11-12(-14) mm. Legumes with a stipe 4-7 mm, erect or spreading, ellipsoid, compressed laterally, 1.3-1.7 cm, 6-8 mm high and 2.5-3 mm wide, sharply keeled ventrally, keeled to narrowly rounded dorsally, shortly acuminate at both ends; valves dirty brownish, sparsely to rather densely covered with subappressed black and white or only black hairs.

● Alpine zone; 2700-3800 m. Sichuan, Xizang, Yunnan.