Glabrous. Leaves opposite; lamina ovate, 8-16 by 4.5-7.5 cm, cuneate to rounded at the base to a petiole 5-8 mm long, shortly acuminate and broadly 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 and the midrib raised below. Inflorescences at the nodes and along the internodes and epicortical runners, a 6-flowered head of 2 sessile triads on a peduncle 2-4 mm long. Corolla in mature bud 5-merous, c. 17 mm long, weakly inflated at the base, clavate and acute at the apex. Anther 2.5-4 mm long, sessile or nearly so.