Glabrous. Leaves opposite; lamina ovate, up to 21 cm long, up to 8 cm wide, shortly cuneate at the base to a petiole up to 25 mm long, acuminate and acute at the apex, dull on both sides but darker above; venation pinnate with the midrib and the incurved main laterals prominent on both sides. Inflorescences at the nodes and along the internodes and epicortical runners, a head of 3 sessile flowers on a peduncle 1-2 mm long. Corolla in mature bud 5-or 6-merous, 15-22 mm long, inflated at the base, weakly clavate and obtuse at the apex, angular, pink or red. Anther 4-6 mm long, sessile or nearly so.
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