Leafy herb to c. 1.7 m; stems and leaves mostly glabrous, the inflorescence sparsely pubescent with non-glandular hairs. Leaves mostly cauline, elliptic to ovate, the lower ones often obovate, the uppermost narrowly elliptic or lanceolate; lamina up to 25 cm long; lower leaves shortly petiolate, the petiole broadly winged, stem-clasping; upper leaves sessile, the base decurrent. Inflorescence panicle-like, few-branched, the lower bracts occasionally leafy. Calyx 15–30 mm long. Corolla-tube usually 40–70 mm long, 1–5 mm wide at top of calyx; limb 20–35 mm (occasionally to 50) diam.; lobes usually obtuse. Upper 4 anthers at the same level or 2 slightly above the other 2, their filaments to 2.5 mm long; filament of the 5th stamen 6–15 mm long, inserted at middle or in lower half of corolla-tube. Capsule ellipsoid to ovoid-ellipsoid, 12–20 mm long. Seeds reniform or acutely angled; testa usually honeycombed.
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