Glabrous. Leaves opposite; lamina narrowly ovate to elliptic or often obovate, 5-10 by 2-7 cm, cuneate at the base to a winged petiole 3-5 mm long, rounded or rarely obtuse at the apex, slightly lustrous above or dull on both sides; venation pinnate with the midrib and the main laterals distinct above and only the midrib dark-coloured and prominent below. Inflorescencess at the nodes, a raceme of 2-5 opposite pairs of flowers; axis 5-20 mm long; pedicels 1-3 mm long. Corolla in mature bud 6-merous, 18-35 mm long, slender and hardly inflated in the lower part, winged at or above the middle, weakly clavate and broadly acute at the apex, mostly pink or violet below, green or rarely dark-colour-ed at the neck and pink to purple above; tube in the open flower 12-24 mm long with the lobes reflexed 2-3 mm higher. Anther 1.5-2 mm long, about half as long as the free part of the filament. Fig. 39.
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