Glabrous. Leaves opposite; lamina narrowly ovate to ovate, 4—10(—13) by 1.5-4(-6) cm wide, cuneate to truncate at the base to a petiole 2-6 mm long, usually acuminate and acute or obtuse at the apex, lustrous above, dull below; venation pinnate with the midrib distinct above and prominent below and the main laterals usually obscure on both sides. Inflorescencess at the nodes, an umbel of usually 1 opposite pair of flowers; axis 0.5-6 mm long; pedicels 2-6 mm long; bracts triangular, acute, c. 1.5 mm long, connate only at the base and spreading as a shallow dish. Corolla in mature bud 6-merous, 30-40 mm long, slender, weakly and unequally winged near the middle, usually curved in the upper part and weakly clavate and acute or obtuse at the apex, mostly red or rarely yellow or green, sometimes violet above; tube in the open flower 20-28 mm long, split more deeply on the concave side, with the lobes reflexed 3-4 mm higher. Anther c. 2 mm long, acute, about half as long as the free part of the filament.
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