Vine. Leaflets very thin. Calyx spur 2.5-3 cm long, proximal half pinkish-red; narrow distal half greenish. Corolla light scarlet; 3 petals with filiform claw and squarish limb c. 1.3-1.4 x 1.2-1.3 cm, emarginate; 2 petals c. 1.7 cm long, cuneate-obovate. Filaments ± pink; anthers light green. Scattered but fairly common.