Glabrous except for the inflorescence and flowers sometimes sparsely brown-tomen-tose. Leaves opposite; lamina lanceolate to broadly ovate, 8-18 by 2.5-6 cm, shortly cuneate at the base to a petiole 4-9 mm long, acuminate and acute at the apex, dull on both sides; venation pinnate but somewhat curvinerved with the veins distinct below. Inflorescences at the nodes, a 2-flowered simple umbel; peduncle obscure or up to 1 mm long; pedicels 2-4 mm long. Corolla in mature bud 5-merous, 25-36 mm long, thin, more or less inflated, acute or obtuse or rounded at the apex, variable in colour but mostly pink or red and often grading to green or yellow above. Anther 2.5-3 mm long, about half as long as the free part of the filament.
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