Herbs, 5-30 cm tall, acaulescent or shortly caulescent with 1 or 2 apparent internodes, from a multiheaded caudex. Stipules ovate, herbaceous, pubescent. Leaves 5-14 cm; petiole and rachis with appressed long trichomes; leaflets verticillate, in 6-13 whorls, 4-6 blades per whorl; leaflet blades oblong, linear, or lanceolate, 5-10 × 1-2 mm, both surfaces with appressed white long trichomes, base cuneate, margin incurved, apex acute. Racemes to 4 cm, lax, 7-10-flowered; peduncle 6.5-7.5(-10) cm, with slightly curved trichomes; bracts lanceolate, shorter than calyx. Calyx broadly cylindric, 4-7 mm; lobes linear, 1-3 mm, with short trichomes. Corolla purple to pale purple; standard 7-12 mm, apex rounded to emarginate; wings 7.5-11 mm, lamina ovate-oblong, apex rounded; keel 7.2-9.5 mm, beak (0.6-)1-2 mm. Legume sessile, ovoid, 7-10 mm and ± as wide, inflated, membranous, with appressed short trichomes, septum ca. 0.5 mm wide, adaxial suture concave, beak hooked. Fl. May-Jul, fr. Jun-Oct.
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