扁序黄耆 bian xu huang qi

Plants 6-30 cm tall. Stems several, ligneous at base, pros­trate to erect, branched, parts of current year 1-12 cm, very densely covered with medifixed, appressed, white hairs 0.6-0.8 mm. Leaves 1-5 cm, subsessile or petiole up to 1 cm, with rachis hairy like stem; stipules ca. 2 mm, very shortly adnate to petiole, white hairy; leaflets in 3(or 4) pairs, linear, 4-15(-20) × 1-1.5 mm, abaxially rather densely and adaxially loosely covered with medifixed, appressed hairs ca. 1 mm. Racemes 2.5-3 cm, 5-12-flowered; peduncle 4-6(-20) cm, hairy like stem; bracts 1-1.5 mm, black and white hairy. Calyx 8-10 mm, covered with medifixed hairs, at dorsal side with predominantly appressed black hairs 0.3-0.5 mm and at ventral side with subappressed to ascending, longer, predominantly white hairs, sometimes all over with white hairs; teeth 0.5-1.5 mm. Petals lilac-purple; standard obovate, 18-22 × 7-9 mm, apex emargi­nate; wings 17-20 mm; keel 15-17 mm. Legumes 12-28 mm, 2-3 mm high and ca. 1.5 mm wide, shortly acuminate; valves densely covered with symmetrically or asymmetrically bifur­cate, subappressed to slightly or partly distinctly ascending, white hairs 0.4-0.8 mm, with some black hairs mixed in.

Sandy and gravelly soil near rivers and lakes. Gansu, Xinjiang [Kazakhstan, Russia (Siberia)].