长柄棘豆 chang bing ji dou

Oxytropis brachybotrys Bunge.

Herbs, (7-)15-35 cm tall, caulescent, arising from a multi­headed caudex, tuft-forming. Stems green to grayish green, erect or ascending, with 3-5 or more apparent internodes, with appressed to spreading trichomes. Stipules lanceolate, 4-7 mm, herbaceous, basally connate. Leaves 3-7 cm, (11 or)13-21(-25)-foliolate; leaflet blades oblong, 5-10(-12) × (1.5-)2-4 mm, both surfaces with appressed trichomes. Racemes initially com­pact but elongating after anthesis, 8-12-flowered; peduncle 4.5-13 cm, much longer than leaves, apically with incurved trichomes; bracts linear, with white and black trichomes. Calyx campanulate, 4.5-5 mm, with black and white trichomes; lobes lanceolate, 2.4-2.5 mm, as long as tube. Corolla purple; stan­dard 8-10 mm, apex rounded; wings ca. 1 cm, almost as long as standard; keel 7-8 mm, beak 1.4-2 mm. Legume stipitate; stipe ca. 5 mm; body lanceolate-oblong, 1.5-2 × 0.3-0.4 cm, pendu­lous, thinly leathery, with long trichomes, adaxial suture deeply grooved. Fl. May-Jun, fr. Jun-Jul.

Sandy and gravelly floodplains; ca. 3900 m. Xizang [Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan, Uzbekistan].