Glabrous except for young shoots, inflorescences and flowers ochrous-to rusty-tomentose, the indumentum persisting on the inflorescence and ovary and usually on the leaf undersurface. Leaves scattered, subopposite or subverticillate; lamina ovate, 9-30 by (3.5—)6—16 cm, truncate to cordate at the base to a slender petiole 15-35 mm long, acuminate and acute at the apex, thin, dull on both sides but darker above; venation pinnate with the midrib and the incurved main laterals distinct above and prominent below. Inflorescencess at the nodes and sometimes on the epicortical runners, a 10-to 20-flow-ered raceme (or spike); axis 30-60 mm long; pedicels (0-)0.5-1.5 mm long; bracts narrow, acute, longer than the ovary. Corolla in mature bud 5-merous, 65-70 mm long, slender, gradually widened to just above the middle and then finely tapered to the apex, mostly yellow, often with red or green in the basal or apical parts; tube in the open flower 40-45 mm long with the lobes reflexed c. 10 mm higher, slightly curved. Anther 5-6 mm long, finely acute, about equal to the free part of the filament. Fig. 20.
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