Glabrous. Leaves opposite or displaced; lamina elliptic to ovate or obovate, 6-15 by 3.5-7(-9) cm, cuneate to attenuate at the base to a winged petiole 4-15 mm long, attenuate and obtuse or rounded at the apex, green above, brown below, dull on both sides; venation pinnate, distinct on both sides with the midrib raised below. Inflorescences few in hollows at the nodes, arising below a periderm layer which is usually shed, a sessile head of usually 3 pairs of triads with all flowers sessile. Corolla in mature bud 6-merous, 13-20 mm long, weakly inflated at the base, slender in the middle, weakly clavate and obtuse at the apex, yellow, sometimes red above; petals in the open flower coherent in the lower 2-5 mm. Anther 3-3.5 mm long, acute.
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