Glabrous. Stem internodes more or less flattened quadrangular upwards when young. Leaves opposite; lamina elliptic, mostly 3-5 cm long, mostly 1.5-3 cm wide, shortly cuneate at the base to a petiole 5-8 mm long, obtuse or rounded at the apex, dull on both sides; venation pinnate with the midrib prominent and the main laterals visible on both sides. Inflorescencess at the nodes, a subumbellate raceme of 2 opposite pairs of flowers; axis 6-10 mm long; pedicels 2-3 mm long. Corolla in mature bud 6-merous, c. 15 mm long, slightly inflated, 6-angular above the middle, with a crown at the apex formed from dorsal appendages on the segments; tube in the open flower c. 7 mm long. Anther c. 3 mm long.
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