Glabrous. Stem internodes flattened and double-edged when young. Leaves opposite; lamina broadly ovate to obovate, 6-12 by 4-7 cm, cuneate at the base to a winged petiole 5-8 mm long, rounded at the apex, dull on both sides; venation pinnate with the midrib and the main laterals distinct. Inflorescences at the nodes; axis 4-5 mm long, 5-7 mm wide; involucral bracts in c. 3 pairs, the longest inner ones oblong, c. 20 mm long, deciduous after anthesis; flowers in 3 or 4 pairs of sessile triads, all sessile. Corolla in mature bud 6-merous, 35-40 mm long, slender, acute at the apex, yellowish brown; tube in the open flower 18-24 mm long and the lobes reflexed c. 8 mm higher. Anther 4-6 mm long; free part of the filament 3-5 mm long. Fig. 29b.
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