Sprawling herb, spreading from taproot, stems 0.3-0.5 m long, minutely bristly with appressed whitish hairs. Leaves distant, pinnately 11-19-foliolate, leaflets narrowly linear. Flowers in ± loose, elongated inflorescences exceeding leaves, dull purple, calyx with blackish hairs. Pod broadly obovate, slightly gibbous, compressed, glabrous, faintly veined, papery, narrowed towards base.