Astragalus porphyrocalyx Y.C.Ho

Plants up to 25 cm tall. Stems 12-15 cm, branched at base, sparsely to loosely covered with appressed white and some black hairs 0.1-0.3 mm. Leaves 2-4 cm; stipules 2-3 mm, lower ones shortly vaginate-connate behind stem, loosely mostly black hairy; petiole 0.5-1 cm, like rachis loosely to rather densely appressed white or white and black hairy; leaflets in 4-7 pairs, narrowly elliptic, 4-12 × 0.8-3 mm, abaxially loosely to rather densely covered with appressed hairs 0.1-0.3 mm, adaxially glabrous. Racemes globose to ovoid, rather densely many flowered; peduncle 1-8 cm, loosely covered with mainly white hairs in basal part and mainly black hairs in upper part; bracts 1.5-2.5 mm, black hairy. Calyx 3-3.5 mm, ± densely covered with appressed black hairs sitting on very mi­nute whitish tubercles; teeth 1-1.5 mm. Petals lilac; standard widely ovate, ca. 7 × 3.5 mm, apex emarginate; wings ca. 6 mm, limbs obovate, emarginate; keel ca. 4.5 mm. Legume sessile, widely ellipsoid, 4-5 mm, 3-3.5 mm thick, widely rounded to truncate at apex without beak, 2-locular; valves strongly cross-wrinkled, with subappressed to somewhat spreading white and black hairs. Seeds 2.