Herb woody at base, or shrub-like, up to 4 m high. Branches terete, 5-7 mm ø, pubescent or hirsute. Leaves chartaceous to subcoriaceous, obovate to oblanceolate, elliptic-oblong, or lanceolate, (13-) 25-36 (-41) by (5-) 8-12.5 (-21) cm; apex short-acuminate or acuminate, sometimes apiculate, base cuneate; glabrous above, pubescent beneath; basal nerves 2 or 3 pairs, the inner one starting from the base or c. 5 mm above it, ascending upward and reaching to more than halfway, similar to the lateral nerves, the outer 1 or 2 much weaker and shorter, close to the margin; lateral nerves 7-10 pairs, elevated and prominent beneath, slightly elevated or flat above; veins transverse, scalariform, some loosely reticulate, joined by weaker crossbar-like or loosely reticulate veinlets, slightly elevated beneath, visible or obscure above; petiole 5-8 (-15) mm, hirsute. Inflorescences axillary, 1-3, often in axils of foliage leaves, simple or sparsely branched, spiciform or racemiform, rarely paniculiform, up to 7 cm long, pubescent; bracts oblanceolate, those at the lower part shorter, pubescent outside, glabrous inside. Pedicel and ovary 15-18 mm, pubescent. Perianth reddish or dark brown and puberulous outside, white and glandular-hairy inside, campanulate, c. 20 mm long and wide; tube c. 8 mm long; lobes broadly rounded, c. 12 by 4 mm, emarginate, reflexed. Stamens in 1 whorl, 9-12, patent or reflexed; filaments c. 3.5 mm, glabrous; anthers oblong, 1.2-2 mm long. Style column short, lobes 9-12, c. 2 mm, glabrous. Capsules erect, elongate, up to 11 cm long, 4-angular, pubescent, glabrescent. Seeds ellipsoid, c. 3 by 1.5 mm, transverse-rugose.
In primary and young forest, mostly on slopes, sometimes in secondary forest, rare, sometimes locally abundant, in lowland up to 450 m. Fl. fr. Feb.-Sept.
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