短序棘豆 duan xu ji dou

Herbs, 15-30 cm tall, caulescent, clump-forming from a multiheaded caudex. Stems erect or prostrate, with 2-4 or more elongate internodes, with lax branches, with spreading white tri­chomes. Stipules leathery, with sparse white long trichomes, basal half connate. Leaves 6-10 cm, 13-21-foliolate; petiole and rachis with sparse trichomes; leaflet blades oblong, 5-10 × 2-4 mm, both surfaces densely appressed sericeous with long trichomes. Racemes dense to lax, many flowered; peduncle ca. 20 cm, with spreading sparse white long trichomes. Calyx 6-8 mm, with dense white long and black short trichomes; lobes 3-4 mm, slightly shorter than tube. Corolla purple; standard 8-10 mm, lamina narrowly orbicular to suborbicular, apex emargi­nate; wings as long as standard, apex rounded emarginate; keel slightly shorter than wings, beak ca. 0.5 mm. Legume shortly stipitate; body oblong, ca. 14.5 × 5.3 mm, 2-locular, with an adaxial suture, with dense black and white short trichomes, sep­tum narrow. Fl. and fr. Aug.

● Gravelly riparian sites, S-facing slopes; 3500-4200 m. Xizang.