Stems twining, terete or upwards slightly angular, glabrous, pale greyish-brown. Leaves ovate or ovate-oblong, 4-10 by 1½-1 cm, rounded or very slightly cordate at the base, acute to shortly acuminate at the apex, thinly coriaceous, in dry state greyish or olivaceous, glabrous, or with a few hairs on the nerves, mainly on the midrib beneath; nerves 8-10 on either side of the midrib; petiole 2-3½ cm, glabrous. Peduncles in the upper leaf-axils, cymosely 1-3(-5)-flowered, 2-7½ cm, glabrous or with some hairs. Pedicels of central flower ca 8-10 mm, of lateral flowers often shorter, glabrous. Bracts narrowly triangular, with incurved apex, ca 2 mm long, glabrous. Sepals glabrous, coriaceous; 2 outer ones broadly ovate-triangular, obtuse, 5 mm long, sepal 3 broadly ovate, obtuse, 5 mm long, with one broad thin margin; two inner sepals broader than long, broadly rounded, concave, ca 4 mm long, with two broad thinner margins. Corolla with deeply divided limb; lobes linear, reflexed and twisted, ca 18 mm long, densely sericeous outside, at the apex with 2 triangular glabrous lobules; tube cylindric, ca 8 mm long, glabrous. Filaments geniculate near their thick, broadened base, pubescent. Ovary glabrous, 2-celled. 'Young fruits oblong-ellpsoid, glabrous, ca 1 cm long' (Merrill).
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