Plant entirely glabrous, or with some appressed hairs in the leaf-axils and on the petioles and the nerves. Stems twining, branches terete or striate. Leaves oblong, ovate, or ovate-ellptic, 10-16 by 4-9 cm, rounded, truncate or slightly cordate at the base, acute to shortly acuminate, mucronulate at the apex; midrib, 5-7 arcuate nerves on either side of it, and reticulate minor nervation distinctly prominent beneath; petiole 2-6 cm, sulcate. Peduncles axillary, straight or curved, 5-7 cm, subangular, cymosely branched at the apex, 1-5-flowered. Pedicels 4-7 mm long. Two outer sepals ovate, acutish, ca 5 mm long; three inner ones slightly longer, up to 6 mm long, broadly ovate, obtuse, with thinner margins. Corolla funnel-shaped, ca 5½ cm long, glabrous outside, red; limb subentire. Stamens and style included. Filaments shortly pilose at the base. Ovary glabrous. Fruit unknown.
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