Glabrous. Leaves mostly opposite, often scattered, sometimes quaternate; lamina lanceolate or elliptic to ovate, (6-)8-20 by (2-)4-7 cm, attenuate to truncate at the base to a petiole 10-20 mm long, obtuse to shortly acuminate and acute at the apex, dull on both sides, sometimes slightly darker above; venation pinnate with the midrib and the main laterals visible on both sides and prominent below. Inflorescencess at the nodes and rarely on the epicortical runners, pedunculate (2-)4-rayed umbels of triads with all flowers pedicellate or rarely with the central flowers apparently sessile; peduncle (3-) 10-25 (-50) mm long; rays (2-)5-10 mm long; pedicels (0-)2-4 mm long. Corolla in mature bud 5-merous, (15-)25-35 mm long, slender, acute at the apex, yellow, orange, red or purple, sometimes grading to green above. Anther 2-3.5 mm long, equal to or shorter than the free part of the filament. Fig. 3e.
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