Stems not manifestly twining, rather stout, sparsely leafy or leafless during flowering, pubescent on the young parts; bark brown. Leaves densely tomentose on both sides; petiole 3–4 1/2 lin. long; blade 3/4–2 in. long, 1/3– 2/3 in. broad, ovate, acute, truncate or subcordate at the base. Cymes corymb-like, many-flowered, axillary; peduncles 1/3– 3/4 in. long; pedicels 4 1/2–7 lin. long, subtomentose. Sepals 1 1/2 lin. long, pubescent. Corolla glabrous on both sides or most minutely papillate (not pubescent) within; tube 3/4 lin. long; lobes 3 1/2 lin. long, rotate, oblong, subacute, revolute along the margins. Corona 20-toothed, besides the teeth within; tube 1 lin. long; the 5 longer teeth 1 1/4–1 1/3 lin. long, spirally coiled at the tips, each alternating with a group of 3 shorter recurved teeth 1/3– 1/2 lin. long; teeth within the tube 5, filiform, 3/4–1 lin. long, with or without a very short or rudimentary tooth at about their middle on the dorsal side, adnate nearly to the top of the tube, forming 5 keels on the lower part of the latter. Anther-appendages large, inflated-oblong. Style with 2 rounded knobs at its apex.
