Herb to 1 m; stems and leaves glabrous or sparsely pubescent with non-glandular hairs. Leaves all or mostly radical, usually elliptic or the upper cauline ones lanceolate to linear, petiolate or upper cauline leaves almost sessile; lamina up to 21 cm long; petiole to 8 cm long, narrowly winged. Inflorescence panicle-like, few-branched, variably pubescent with glandular hairs. Calyx 6–22 mm long. Corolla-tube 15–64 mm long, 1–2 mm wide at top of calyx; limb 7–25 mm diam., the lobes notched. Upper 4 anthers at the same level or 2 slightly above the other 2, the filaments to 3.5 mm long; filament of the 5th stamen 5–18 mm long, inserted in upper half of corolla-tube. Cleistogamous flowers occasionally present. Capsule ellipsoid to narrowly ellipsoid, 6–16 mm long. Seeds usually reniform or acutely angled; testa irregularly honeycombed or wrinkled.
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