Perennial, twining, lactiferous, sub-erect herb, up to 1 m tall, covered with dense, grey pubescence. Leaves are petiolate, cordate, and thick, up to 3.5 cm long and 3 cm wide. Flowers are pale reddish, about 15 mm across, borne on peduncules and arranged in extra-axillary, umbellate cymes. Corolla lobes are densely hairy on the outside and spread to up to 7 mm long. Fruits are follicles, up to 7.5 cm long, rostrate-tapering, with prominent tubercles or short, soft spines.