土丹棘豆 tu dan ji dou

Herbs, to ca. 5 cm tall, caulescent, from a partially subter­ranean many-branched caudex. Stem with 1 or more apparent internodes, densely glandular or with yellowish brown tri­chomes. Stipules broadly ovate, 4-5 × 2-3 mm, herbaceous, pubescent, basally connate. Leaves 2-4 cm, 13-17-foliolate; petiole and rachis with yellowish brown trichomes; leaflet blades elliptic to ovate, 3.6-4.7 × 2.1-3.1 mm, both surfaces with glandular or yellowish brown trichomes. Racemes capi­tate, 2-5-flowered; peduncle 2-4 cm, shorter than leaves, some­times with glands; bracts linear to narrowly elliptic, 4-5 × 0.4-0.5 mm, yellowish brown pubescent. Calyx cylindric, ca. 5 × 1.4 mm; lobes subulate, ca. 2.5 × 0.3 mm, subequal. Corolla bluish violet; standard ca. 8.6 × 8 mm, lamina broadly ovate, apex ± emarginate; wings ca. 7 mm, lamina narrowly obovate, apex emarginate; keel ca. 6 mm, beak ca. 0.4 mm. Legume unknown. Fl. Jul-Aug.

● Hillsides; 2800-4900 m. Gansu, Xizang.