Perennial twining or climbing herbs or subshrubs. Leaves pinnately 3-foliolate; stipules and stipels deciduous or persistent; leaflets sessile or shortly petiolulate. Raceme axillary; flowers small, paired, clustered, or sparsely arranged; bracts and bracteoles 2, small, acute, persistent. Calyx campanulate; lobes shorter than tube, unequal, upper 2 connate. Corolla usually purple, light purple, or red, longer than calyx, 7-8 mm in diam.; standard ovate or broadly ovate, almost erect, without auricles, longer than other petals; wings narrow, oblique, with auricles, longer than keels and connate with them; keels straight and with blunt auricles and stipe. Stamens diadelphous; anthers small, uniform. Ovary subsessile or shortly stipitate; style inflexed, filiform, glabrous; stigma terminal, capitate. Legume linear, compressed, slightly curved, 4-5 cm, shortly stipitate or sessile, 4-11-ovuled, septate. Seeds suborbicular, oblong, or reniform; hilum short, without strophiole.
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