Herb to 1 m, moderately pubescent with glandular hairs. Leaves radical and cauline, broadly triangular to broadly cordate, the upper leaves narrower; lamina up to 20 cm long, 13 cm wide; petiole to 11 cm long, broadly winged, the base occasionally auriculate and stem-clasping. Inflorescence panicle-like, few-branched; lower bracts leafy. Calyx 7–25 mm long. Corolla-tube 18–50 (usually 22–45) mm long, 1–3.5 mm wide at top of calyx; limb 10–40 mm diam., the lobes usually obtuse. Upper 4 anthers at the same level or nearly so, their filaments to 2.5 (occasionally to 5) mm long; 5th filament to 6.5 (occasionally to 14) mm long, usually inserted in upper half of corolla-tube. Capsule ovoid to broadly ellipsoid, 6–12 mm long. Seeds reniform; testa with wavy-edged honeycomb or irregular wrinkles.
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