Herbs, perennial. Taproot conical, strong. Stems many from collar, slender, branched, sometimes with adventitious roots. Leaves imparipinnate; stipules brown, ovate or elliptic, membranous, amplexicaul and opposite to leaves; leaflets elliptic, orbicular, or cordate, apex rounded to retuse, rarely bifid. Umbel 1-4-flowered, on axillary peduncles. Calyx brown, upper 2 teeth larger and joined. Corolla usually dark purple, rarely yellow; standard broadly obovate or obcordate, clawed; wings broadly obovate, equal in length to standard; keel oblong or obovate, small. Stamens diadelphous. Ovary cylindric, pilose or glabrous; style rolled inward. Legume cylindric, with many seeds. Seeds reniform, smooth.
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