Glabrous. Leaves opposite; lamina narrowly ovate to ovate, 10-16(-30) by 5-13 cm, cuneate at the base to a petiole 4-12 mm long (in Peninsular Malaysian specimens sometimes truncate or cordate at the base and subsessile), acuminate and acute at the apex, slightly lustrous above, dull below; venation pinnate with the midrib and the main laterals distinct on both sides. Inflorescences at the nodes and sometimes along the inter-nodes and on the epicortical runners, a raceme (sometimes subumbellate or umbellate) of 1-4 opposite pairs of flowers; axis 5-17 mm long; pedicels 3-7 mm long; bracts 1-2 mm long, rounded, the laterals sometimes connate. Corolla in mature bud 6-merous 60-100 mm long, gradually widened upwards, moderately winged below the neck clavate, ribbed and rounded at the apex, mostly red or rarely yellow below and often striped green or darker red and white or cream above; tube in the open flower 45-75 mm long with the lobes reflexed or 5-7 mm higher. Anther 5-7 mm long, weakly sagittate at the base, acute, slightly shorter than the free part of the filament. Fig. 38e.
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