二型叶棘豆 er xing ye ji dou

Herbs, 3-5 cm tall, acaulescent, from a simple or branching caudex, subglabrous. Branches with a thatch of mar­cescent leaf bases. Stipules ovate, ca. 4 mm, membranous, per­sistent, with white trichomes, adnate to petiole, apex acute. Leaves 3-5 cm, 3-foliolate. Eophylls (early leaves): petiole ca. 7 mm; leaflet blades lanceolate-obovate to elliptic, 5-10 × 2-3 mm, abaxially with dense white trichomes, adaxially with dense trichomes, base cuneate, apex acute. Mature leaves: petiole 1.5-4 cm, appressed sericeous; leaflet blades narrowly linear, 1.7-4.5 cm × 2-4 mm. Racemes 1- or 2-flowered; peduncle 2-8 mm, much shorter than leaves, with dense trichomes; bracts linear, ca. 3 mm, membranous, densely sericeous-pubescent. Calyx tubular, 0.9-1.2 cm, with appressed dense white tri­chomes; lobes lanceolate, 2-3 mm. Corolla pale yellow; stan­dard 1.8-2.2 cm, lamina obovate, apex rounded; wings ca. 1.8 cm, apex rounded; keel ca. 1.6 cm, beak ca. 1 mm. Legume ses­sile, ovoid, 1-1.5 × ca. 1 cm, inflated, membranous, ± 2-locular, with dense white long trichomes, septum ca. 3 mm wide, adax­ial suture grooved, apex beaked. Fl. Apr-May, fr. May-Jun. 2n = 16.

Dry Stipa grasslands, stones in valleys, hillsides; 1000-2200 m. Nei Mongol [Mongolia].