Herbs, perennial, twining. Stems 4-angled, angles with descending brown hairs. Leaves pinnately 3-foliolate; stipules ovate, tapering, longitudinally striate, persistent; stipels small, persistent. Flowers small, arranged in axillary racemes, with irregular branches at lower part of inflorescence; bract at base of pedicel persistent, lanceolate; bracteoles at base of calyx persistent. Calyx membranous, campanulate, 5-lobed; calyx teeth lanceolate, equal to calyx tube or slightly longer, upper pair often connate. Corolla slightly exserted; standard obovate, large, shortly clawed, not auriculate; wings narrowly oblong, with long claw, adnate to keel; keel blunt, with long beak at apex, with long claw at base, subequal to wings. Stamens monadelphous. Ovary sessile, 6-8-ovuled; style short, curved; stigma small, capitate. Legumes linear, flattened, slightly curved, shortly beaked at apex; valves transversely impressed between seeds. Seeds 4-8, strophiolate.
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