Glabrous. Stem internodes quadrangular when young. Leaves opposite; lamina ovate to obovate, 3-10 by 1.5-8 cm, cuneate at the base to a distinct petiole 8-16 mm long, rounded at the apex, dull on both sides; venation pinnate with the midrib distinct above and raised below and the main laterals obscure above and visible below. Inflorescences at the nodes; axis 4-6 mm long, 5-7 mm wide; involucral bracts in 8 or 9 pairs, the longest inner ones narrowly spathulate, 20-30 mm long, spreading somewhat after anthesis; the flowers in 1-3 pairs of sessile triads, all shortly pedicellate. Corolla in mature bud 6-merous, 28-33 mm long, slender, gradually widened upwards, obtuse at the apex, red or rarely greenish yellow; tube in the open flower 9-13 mm long and the lobes reflexed 12-14 mm higher. Anther 4-6 mm long; free part of the filament 0.5-1 mm long.
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