A twining or clump-forming herbaceous plant. Leaves are trifoliate, composed of three narrow, oval-shaped leaflets. Leaflets are noticeably hairy and have a silky texture. Flowers are typical ‘pea’ flowers of vivid pink (rarely white). Older flowers often blue. Flowering often very profuse. Flowers are followed by short, hairy, straight or slightly curved pods. Up to 10 seeds are held in each pod. These are dark and firm at maturity.