Herb to c. 70 cm, variably pubescent with glandular hairs. Leaves mostly cauline, broadly cordate to triangular, the upper ones narrowly ovate, occasionally linear; lamina up to 12 cm long, 10 cm wide; petiole to 11 cm long, very narrowly winged, not stem-clasping. Inflorescence panicle-like, few-branched. Calyx 6–15 mm long. Corolla-tube 40–65 mm long (occasionally shorter), 1–2.5 mm wide at top of calyx; limb 20–35 mm diam., the lobes usually acute. Upper 4 anthers borne at slightly different levels, their filaments 1.5–2.5 mm long; 5th filament 2–7 mm long, inserted in upper half of corolla-tube. Capsule ovoid-ellipsoid, 6–10 mm long. Seeds reniform; testa irregularly honeycombed or wrinkled.
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