尖叶棘豆 jian ye ji dou

Phaca oxyphylla Pallas, Reise Russ. Reich. 3: 743. 1776; Oxytropis andaensis P. H. Huang & L. H. Zhuo; O. arenaria Jurtzev; O. chankaensis Jurtzev; O. hailarensis Kitagawa; O. hailarensis f. chankaensis (Jurtzev) Kitagawa; O. hailarensis var. chankaensis (Jurtzev) Kitagawa; O. hailarensis f. leiocarpa (H. C. Fu) P. Y. Fu & Y. A. Chen; O. hailarensis f. psilocarpa (Kitagawa) Kitagawa; O. hulunbailensis H. C. Fu & S. H. Cheng; O. hulunbailensis var. leiocarpa H. C. Fu; O. lanata (Pallas) Candolle var. psilocarpa Kitagawa; O. oxyphylla var. leiocarpa (H. C. Fu) Y. Z. Zhao; O. oxyphylla var. psilocarpa (Kitagawa) G. Z. Qian; O. selengensis Bunge; O. selengensis var. longiscapa Hurusawa; O. verticillaris Ledebour (1842), not Candolle (1802).

Herbs, 7-20(-25) cm tall, acaulescent, arising from a sub­terranean long-branched multiheaded caudex, appressed serice­ous. Stipules broadly ovate to triangular-ovate, 5-9 mm, herba­ceous, densely appressed white or yellow sericeous. Leaves 2.5-14 cm; leaflets at least some verticillate or sometimes sub­verticillate, in (1-)3-9 whorls, 3 or 4 blades per whorl; leaflet blades linear-lanceolate, oblong-lanceolate, or linear, 1-2 cm × 1-3 mm, both surfaces sericeous. Racemes capitate, 5-15-flowered; peduncle 6-11(-19) cm, equal to or longer than leaves; bracts lanceolate to narrowly lanceolate, 2.5-6 mm, membranous, sericeous with appressed white long trichomes, apex acute. Calyx cylindric, 6-8.3(-10) mm, with intermixed black and white long trichomes, base oblique; lobes linear-lan­ceolate, 1.8-3.5 mm. Corolla purple, pale purple, or rarely white; standard 1.4-1.8 cm, lamina elliptic-ovate, apex rounded; wings 1.2-1.6 cm, lamina obliquely obovate, apex obliquely truncate to rounded; keel 1-1.4 cm, beak 1.5-2.5 mm. Legume sessile, ovoid, 1-2 × 0.7-1.2 cm, inflated, spreading-ascending, membranous, with white or sometimes black trichomes. Fl. Jun-Jul, fr. Jul-Aug. 2n = 16.

Sandy open hillsides, semistabilized sand dunes, gravelly areas, grasslands; 500-2700 m. Gansu, Heilongjiang, Jilin, Liaoning, Nei Mongol, Qinghai, Shaanxi [Korea].