Glabrous. Leaves opposite or slightly displaced; lamina elliptic to obovate, 5-10 by 2-5 cm, cuneate at the base to an obscure winged petiole 8-15 mm long, rounded at the apex, dull on both sides but darker above; venation pinnate with the midrib distinct above and raised below and the main laterals obscure. Inflorescences at the nodes; axis 3-6 mm long, 3-4 mm wide; involucral bracts in 4-5(-7) pairs, the longest inner ones oblong, 20-25 mm long, deciduous after anthesis; flowers in 3-5 pairs of minutely pedunculate triads, all with pedicels 0.5-2 mm long at anthesis, elongating in fruit. Corolla in mature bud 6-merous, 23-32 mm long, slender, very slightly inflated at the base, obtuse at the apex, yellow or green, sometimes red below; tube in the open flower 2.5-5 mm long and the lobes reflexed 12-19 mm higher. Anther 3.5-5 mm long; free part of the filament 1-5 mm long.
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