Glabrous except for the inflorescence rarely sparsely pubescent. Leaves opposite; lamina narrowly elliptic or ovate to broadly ovate, mostly 5-14 cm long, mostly 2-6 cm wide, cuneate to truncate at the base to a petiole 2-12 mm long, usually acuminate and acute to obtuse at the apex, shining and often varnished above, dull below; venation pinnate with the midrib and the main laterals distinct on both sides. Inflorescencess at the nodes, a raceme of 4-6 opposite evenly spaced pairs of triads with the central flower sessile and the lateral flowers sessile or very shortly pedicellate; axis usually 20-40 mm long, flowerless in the lower 4-15 mm; peduncles of the triads 1.5-3 mm long, secund; pedicels of the lateral flowers (when present) up to 0.5 mm long. Corolla in mature bud 6-merous, 22-30 mm long, weakly inflated at the base, slender above, acute at the apex, mostly red below and green or yellow above; petals in the open flower coherent in the lower 1-3 mm. Anther 2-3 mm long, acute, usually slightly shorter than the free part of the filament. — Fig. 19.
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