Herbs, 22-35 cm tall, acaulescent, from a multiheaded caudex. Branches clothed with marcescent stipules. Stipules lanceolate to narrowly lanceolate, 0.8-1.4 cm, thinly membranous, densely pilose, basally adnate to petiole, shortly connate, apex subulate-acuminate to obtuse. Leaves 3-20 cm; petiole 1-5 cm; leaflets verticillate, in 3-5 whorls; leaflet blades linear to linear-oblong, 0.5-1.5 cm, abaxially tubercular-glandular. Racemes rather lax, 3-6-flowered; peduncle 6-13 cm, subequal to leaves, with spreading trichomes. Calyx cylindric, 1.1-1.5 cm, with appressed black and white trichomes and with glandular trichomes; lobes 3-4 mm. Corolla purple; standard ca. 2.2 cm, lamina elliptic, apex rounded; wings 1.6-1.8 cm; keel ca. 1.6 cm, beak ca. 1.5 mm. Legume cylindric. Fl. Jun-Aug, fr. Jun-Aug.
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