Glabrous. Leaves opposite; lamina narrowly ovate, 12-20 by 2.5-7 cm, attenuate at the base to an obscure winged petiole 2-5 mm long, acuminate and acute at the apex, lustrous above, dull below; venation pinnate with the midrib and the main laterals distinct on both sides. Inflorescences at the nodes, a raceme of 2 or 3 decussate pairs of triads with the central flowers sessile and the lateral flowers pedicellate; axis 6-10 mm long; peduncles of the triads 1—3(—6) mm long; pedicels of the lateral flowers 2-5 mm long. Corolla in mature bud 6-merous, 45-65 mm long, robust, slightly inflated, weakly clavate and acute or obtuse at the apex, red below and yellow above; tube in the open flower 25-35 mm long. Anther 5-7 mm long, acute, about equal to the free part of the filament. Style articulate 2-3 mm above the base.
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