Glabrous. Leaves opposite; lamina (in the Malesian region) narrowly ovate to ovate, 9-15 by 2.5-7 cm, shortly cuneate to truncate at the base to a petiole 2-8 mm long, acuminate and acute at the apex, dull on both sides; venation pinnate with the midrib prominent below and the main veins distinct on both sides. Inflorescences at the nodes, a pseudo-umbel of 1 opposite pair of subsessile flowers; axis 1-3 mm long; pedicels 0-1 mm long; central bract orbicular, 2-3 mm long; lateral bracts 2-3 mm long, connate, together almost completely enclosing the ovary. Corolla in mature bud 6-merous, 55-85 mm long, winged at about two thirds the length, clavate and often minutely mucronate at the apex, red or green below, often green at the neck and red above; tube in the open flower 40-60 mm long with the lobes reflexed slightly higher. Anther 5-8 mm long, obtuse, equal to or shorter than the free part of the filament.
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