A high climbing herbaceous or semi-woody climber
White or greenish sweet-scented flowers.
Herbaceous, sparsely pubescent to glabrous climber, up to 2-3 m tall, with milky sap. Leaves cordate 20-50 x 15-50 mm. Flowers in lax, pedunculate, extra-axillary umbels. Corolla rotate with short tube, 12-20 mm diam., lobes spreading 5-10 x 2-4 mm, yellow. Corona white, in 2 series, outer tubular and basally fused to mouth of corolla tube, with short quadrate lobes beneath guide-rails, inner series of 5 sagittate lobes behind anthers and projecting towards centre over them. Follicles paired, densely covered with fleshy bristles 5-12 mm long.