Coarse perennial herb, 0.5-2 m. Stem erect, woody, 4-angled, densely tomentose. Leaves herbaceous, elliptic-oblong, ovate or obovate, 15-30 by 5-10 cm, acute, base abruptly cuneate or subtruncate; margin crenate or crenate-serrate; hispid above, densely pubescent beneath; petiole 1-3 cm, densely tomentose. Flowers 10-15 in dense, axillary verticillasters. Bracts ovate-lanceolate, 6-10 mm long. Pedicels 4.7 mm. Calyx 1-1.5 (-2) cm long, often very prominently ribbed, hirsute within; teeth lanceolate, acute or acuminate, generally shorter than the tube. Corolla creamy yellowish white or white, 4-4.5(-5) cm long, distinctly incurved, tomentose externally. Style sparingly hirsute when young, later glabrous; ovary villous. Nutlets 1-4, smooth, hispid at the apex, 6 by 4 mm, glassy-whitish.
In shaded localities, mainly (rain-)forests, also in teak forests under a seasonal climate, from the lowland to c. 2400 m. Fl. Jan.-Dec.Galls on sprouts and inflorescences are caused by gall-gnats.
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