Astragalus frigidus A.Gray

Plants 8-35 cm tall, mostly nearly glabrous; hairs 0.3-0.5 mm. Stems at base 2-5 mm thick. Leaves 5-15 cm; stipules 1-2 cm; petiole 1-3 cm, like rachis glabrous or sparsely appressed white hairy; leaflets in (3 or)4-6(-8) pairs, narrowly ovate to narrowly elliptic, 15-35(-45) × 7-19 mm, abaxially light gray-green with a distinct darker net of nerves, mostly sparsely appressed hairy, adaxially dark green, mostly glabrous, apex rounded to subacute. Racemes rather densely 5-20-flowered; peduncle 5-10 cm, appressed black hairy or nearly glabrous; bracts greenish, narrowly ovate, 5-10 mm, at margins with pre­dominantly black hairs. Calyx shortly tubular, 6-9 mm, in basal part subglabrous, toward teeth more densely hairy, sometimes only at teeth black hairy; teeth equal, triangular, 0.3-1 mm. Petals pale yellow; standard obovate to nearly orbicular, 14-17 × ca. 8 mm; wings 13-16 mm; keel 13-15 mm. Legumes with a stipe up to 8 mm, pendulous, inflated, narrowly ellipsoid, 1-2.5 cm, 3-4 mm high and 5-7 mm wide, flat ventrally and dor­sally, acuminate at both ends; valves loosely or rather densely covered with very short appressed black hairs.