Glabrous except for the young shoots, inflorescences and flowers shortly ochrous tomentose and soon glabrescent except for the ovary. Leaves opposite, sessile; lamina broadly ovate, 5-10 by 3-5.5 cm, cordate at the base, rounded at the apex, dull on both sides; venation pinnate but almost curvinerved with the midrib and the main laterals distinct on both sides. Inflorescences at the nodes, a 3-to 5-flowered raceme; axis 2-8 mm long; the pedicels c. 2 long. Corolla in mature bud 5-merous, 30-35 mm long, slender, slightly inflated in the middle, weakly clavate and acute at the apex; tube in the open flower 14-17 mm long with the lobes reflexed 3-5 mm higher, curved. Anther c. 3 mm long, obtuse, slightly shorter than the free part of the filament.
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