单叶棘豆 dan ye ji dou

Herbs, 3-8 cm tall, acaulescent, from a multiheaded cau­dex, cushion- or tuft-forming. Stipules obovate, ca. 5 mm, membranous, with white long trichomes, free, basally connate, apex obtuse. Leaves 1-foliolate; petiole 5-10 mm; leaflet blade lanceolate-elliptic, ca. 3.5 cm × 3-8 mm, erect, margin entire, base obtuse, apex acute. Flowers solitary, sessile. Calyx cylin­dric, 0.9-1.4 cm, densely appressed white villous and with white and black trichomes on apical part; lobes triangular-sub­ulate, 2-3 mm. Corolla purple; standard 1.8-2 cm, lamina ob­long-obovate; wings ca. 1.5 cm, lamina oblong; keel ca. 1.4 cm, beak short. Ovary glabrous. Legume unknown. Fl. May-Oct.

Deserts; ca. 3700 m. Nei Mongol, Ningxia [Mongolia].