多枝棘豆 duo zhi ji dou

Herbs, 10-20 cm tall or taller, caulescent, with appressed white trichomes. Stems prostrate, with several to many evident internodes, many branched. Stipules linear-lanceolate to lanceo­late, 3-6 mm, herbaceous, with spreading white long trichomes, free from petiole, basally connate, apex acute. Leaves 3-5 cm; leaflets verticillate or rarely opposite, in 2-5 whorls, 3 or 4 blades per whorl; leaflet blades linear to narrowly oblong, 5-10 × 1-3 mm, both surfaces with dense white trichomes, base cu­neate, margin involute, apex acute. Racemes 1-3-flowered; pe­duncle 5-8 mm, with appressed white trichomes; bracts linear-lanceolate, 2-3 mm, with white trichomes, apex acute. Calyx broadly cylindric, ca. 5 × 2 mm, with appressed white tri­chomes; lobes lanceolate-subulate, shorter than tube. Corolla bluish purple; standard 1.1-1.3(-1.5) cm, lamina obovate, apex emarginate; wings 1.1-1.2(-1.3) cm, apex rounded to emar­ginate; keel 9-10(-11.2) mm, beak 1-1.2 mm. Legume sessile, ellipsoid, ovoid, or oblong-ovoid, 0.8-1.6 × 0.6-1.2 cm, leath­ery to thinly so, densely pubescent, beak 0.8-1 mm. Fl. May-Aug, fr. Aug-Sep.

● Active and partially stabilized sand dunes and sandy slopes; 900-1400 m. Gansu, Nei Mongol, Shaanxi.