Perennial, stem twining, hollow, glabrous except for a band of hairs running along the internodes. Leaves 6.5-15 cm x 5-12.5 cm, broadly ovate to ovate-lanceolate, deeply cordate, acute to acuminate, margin often undulate, sparsely pubescent with short appressed hairs to glabrous above, puberulous on the nerves beneath, basal nerves 5-7, few small conical glands at the base of the midrib. Petiole 2.5-8.0 cm long. Many flowered cymes on 3-15 cm long, peduncle, arising singly at node, puberulous. Pedicel 1.2-1.3 cm long, slender puberulous. Bract up to 8 mm long. Calyx c. 4.5 mm long, lobed almost to the base, ciliate. Corolla white to yellowish-green, c. 6-8 mm long, divided nearly to the base, lobes pubscent within. Corona cupshaped, deeply 5-lobed, lobes oblong, obtuse bearing 5 small scales on the inner faces. Style apex conical, 2-lobed, slightly exserted beyond the stamens. Follicles 7.5-10 cm x 15 cm elliptic-lanceolate, smooth. Seeds 8-9 mm long, oval, brown, compressed; coma 2.5 cm long.