Herb to 1.2 m, variably pubescent with glandular hairs. Leaves radical and cauline, or mostly radical, the lamina up to 23 cm long and 12 cm wide; radical leaves elliptic, petiolate, the petiole to 9 cm long, narrowly to broadly winged, the base usually slightly stem-clasping; cauline leaves narrowly ovate or elliptic, petiolate, the upper ones lanceolate, sessile and slightly stem-clasping. Inflorescence panicle-like, few-branched; lower bracts occasionally leafy. Calyx 5–17 mm long; intersepalar membranes often conspicuous. Corolla-tube 20–40 mm long, to 3.5 mm wide at top of calyx; limb usually 10–20 mm diam., the lobes notched. Cleistogamous flowers with much shorter corolla-tube occasionally present. Two of upper 4 anthers usually above the other 2, the filaments to 5 mm long; filament of the 5th stamen 2–8 mm long, inserted in upper half of corolla-tube or half-way down. Capsule ovoid to ellipsoid, 5–13 mm long. Seeds reniform or acutely angled; testa usually regularly honeycombed.
Grows in sandy androcky soils, usually in shelter of boulders or in litter under trees,frequently near minor water courses.
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