A coarse perennial herb, 60-150 cm, woody below. Stem stout, erect, hoary pubescent and scabrid. Leaves herbaceous, oblong-ovate, 12-15 by 7-9 cm, acute, base abruptly cuneate, entire; margin elsewhere entire or crenate or remotely toothed, finely stellate-pubescent on both surfaces; petiole of upper leaves 1-2 cm, of lower leaves 4-5 cm, scabrid. Flowers in dense, few-flowered verticillasters in the axils of the lower leaves and on the bare stem below the leaves. Bracts ovate-lanceolate, entire, 6-7 mm long. Calyx 6-7 mm long; teeth short, triangular, less than half as long as the tube. Corolla tubular, orange-yellow, cream pale yellow, or whitish, 2.5-3.5 cm long, puberulent outside; throat very narrow. Style and ovary glabrous. Nutlets smooth, glabrous.
Lowland rainforest, also in bamboo forest, in Malaya also found on limestone hills, mostly at low altitudes, but in Sumatra ascending to c. 1800 m. Fl. Jan.-Dec.
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