Glabrous except for the ovary shortly tomentose and more or less tuberculate and the distal part of the corolla weakly to strongly papillose in bud. Leaves opposite; lamina narrowly obovate to spathulate, 3-4 by 1-2 cm, attenuate at the base to a petiole 1-3 mm long, rounded at the apex, dull on both sides; venation almost curvinerved with the midrib and the main laterals visible above and only the midrib prominent below. Inflorescences at the nodes, an umbel of 1 pair of flowers, sometimes extended as a raceme of 2 pairs of flowers; axis 1.5-6 mm long; pedicels 1-2 mm long; bracts small, the lateral ones usually connate. Corolla in mature bud 6-merous, 10-15 mm long, widened upwards to 6 tooth-like wings in the middle, clavate and obtuse or rounded at the apex, yellow or green; tube in the open flower 5-8 mm long with the lobes reflexed 2-3 mm higher. Anther c. 1 mm long, obtuse, about half as long as the free part of the filament.
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