Erect shrublet to 40 cm. Leaves unifoliolate, opposite on flowering branches, oblong-cordate to orbicular-cordate, young leaves rolled over backwards. Flowers solitary, keel rostrate, calyx lobes much longer than tube, upper lobes broader and falcate, lower lobe very narrow, shorter than the others, with wing-like extension on tube between upper lobes. Pods stipitate, stipe curved, oblong.