Glabrous. Stem internodes distinctly two-edged when young. Leaves opposite; lamina narrowly ovate to ovate, 4-9 by 1-4 cm, usually cordate at the base and sessile, sometimes shortly cuneate at the base to a petiole up to 4 mm long, acuminate and acute at the apex, slightly lustrous above, dull below; venation pinnate with the midrib distinct and the main laterals visible on both sides. Inflorescences at the nodes, a sometimes subum-bellate raceme of 1-4 opposite pairs of flowers; axis 5-20 mm long; pedicels 1-3 mm long. Corolla in mature bud 6-merous, 35-45 mm long, slightly widened upwards, winged above the middle, angular, clavate and acute at the apex, red, sometimes with a dark band at the neck; tube in the open flower 24-30 mm long with the lobes reflexed 4-7 mm higher. Anther 2.5-3.5 mm long, acute, about half as long as the free part of the filament. Fig. 38c.
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