Herb to 90 cm, densely pubescent with glandular hairs. Leaves radical and cauline or mostly radical, petiolate or sessile; lower leaves elliptic to ovate, the upper cauline ones lanceolate to linear; lamina up to 17 cm long; petiole to 9 cm long, usually narrowly winged. Inflorescence panicle-like, few-branched. Calyx 10–20 mm long. Corolla-tube 35–95 mm long, to 2.5 mm wide at top of calyx; limb 15–35 mm diam., the lobes usually notched. Upper 4 anthers at about same level, their filaments to 2 mm long; filament of 5th stamen 1.5–11 mm long, inserted in upper half of corolla-tube. Capsule ovoid-ellipsoid, 7–16 mm long. Seeds reniform or acutely angled.
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