Glabrous except for the inflorescence, calyx and corolla shortly white to brown tomentose. Leaves opposite; lamina elliptic to ovate, 8-30 by 4-12 cm, mostly truncate to weakly cordate at the base to a petiole 10-30 mm long, attenuate or acuminate and acute at the apex, dull or slightly lustrous on both sides, often paler below; venation pinnate with the midrib and the main laterals distinct on both sides and the midrib prominent below. Inflorescences at the nodes and on the epicortical runners, a raceme with 1-5 whorls of triads, these sometimes condensed together or displaced into spirals; axis variable, 5-35 mm long, 1-2 mm thick, flowerless in the lower 3-30 mm; triads at the first node 8-10, at the second node (when present) 4-12, at the third node (when present) c. 10, at the fourth and fifth nodes (when present) 4-6; peduncles of the triads 3-10 mm long; pedicels of the lateral flowers 1-3 mm long. Corolla in mature bud usually 6-merous, less frequently 5-to 8-merous, 25-50 mm long, slender, weakly clavate and acute at the apex, red, pink, orange or yellow below, paler and yellowish or greenish above. Anther 2.5-5 mm long, mostly equal to or slightly longer than the free part of the filament. Fig. 17c-f.
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