Astragalus luteolus H.T.Tsai & T.T.Yu

Plants 30-100 cm tall, with hairs 0.3-0.8 mm. Stem up to 5 mm thick, subglabrous at base, in upper part loosely ap­pressed white hairy. Leaves (4-)7-10 cm; stipules narrowly tri­angular, (3-)6-10 mm, white or black ciliate; petiole 0.4-1.2 cm, like rachis sparsely to rather loosely covered with appressed to subappressed mostly white hairs; leaflets in (2-)4-7 pairs, narrowly ovate, 15-40 × 6-14 mm, abaxially gray-green and loosely hairy, adaxially dark green and glabrous to sparsely hairy, apex rounded to slightly emarginate. Racemes at anthesis densely 7-to many flowered, at fruiting time elongated up to 10 cm; peduncle 4-13 cm, loosely appressed, mostly white hairy; bracts whitish, linear-acute, 2-5 mm, white and blackish hairy. Calyx shortly tubular, 6-7 mm, ± densely ap­pressed white and black hairy; teeth subulate, unequal, 1-1.5 mm. Petals yellow; standard elliptic to ovate, 12-14 × ca. 5 mm; wings 11-11.5 mm; keel 10-11 mm. Ovary with a stipe ca. 2 mm, white hairy; style with short spreading hairs just be­low stigma on abaxial surface. Legumes with a stipe 4-5 mm, narrowly ellipsoid, 1.8-2.5 cm × 5-7 mm, inflated, apex long acuminate; valves papery, densely covered with short, as­cending black and white or only black hairs.