Glabrous. Stem internodes quadrangular when young, soon becoming terete. Leaves opposite; lamina mostly oblong to suborbicular, mostly 8-12 cm long, mostly 3-6 cm wide, thick, cuneate to truncate at the base and sessile or subsessile or with a petiole to 5 mm long, rounded or rarely attenuate and acute or obtuse at the apex, slightly lustrous above, dull below; venation pinnate with the midrib visible above and prominent below and the main laterals visible on both sides. Inflorescencess at the nodes, a raceme of (3-)5-9 opposite pairs of flowers; axis 20-42 mm long; pedicels 1-3 mm long. Corolla in mature bud 6-merous, 13—18(—23) mm long, slightly inflated in the lower part, weakly winged near the middle, angular, clavate and obtuse at the apex, yellow or green or becoming red below, green at the neck and green or yellow above; tube in the open flower 6-9(—11) mm long with the lobes reflexed 2-4 mm higher. Anther 1.5-2.5 mm long, obtuse, about half as long as the free part of the filament. Fig. 38d.
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