Subshrubs. Stem ascending, 30-60 cm tall. Leaves 1-foliolate; petiole 0.7-3.2 cm, conspicuously winged; wing 3-7 mm wide; blade ovate, sometimes ovate-orbicular, 3-10 × 1.3-5.2 cm, usually less than 3 × as long as wide, lateral veins ca. 8 pairs, not reaching margin but arching and joining together, abaxially sparsely pubescent on veins, adaxially glabrous, base cordate, apex acute. Inflorescences to 25 cm, 2-or 3-flowered fascicles at each node. Pedicel ca. 5 mm, with minute hooked and silky hairs. Calyx ca. 5 mm; lobes lanceolate, slightly longer than tube. Corolla purplish red, ca. 7 mm; standard nearly orbicular, emarginate at apex; wings obovate, base auriculate; keel falcate, not auriculate, clawed. Ovary puberulent; style glabrous. Legume 5-8-jointed, densely white pubescent on both sutures, lateral surfaces reticulate veined, entirely glabrous. Fl. Aug, fr. Oct-Nov.
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