Herb to 1 m, often with many stems; stems and leaves usually glabrous. Leaves mostly radical, elliptic to spathulate, the cauline ones narrower; lamina up to 20 cm long; petiole to 8 cm long, narrowly winged; upper leaves sessile. Inflorescence panicle-like, usually few-branched, pubescent with glandular hairs. Calyx 4–12 mm long. Corolla-tube 8–20 mm long, 1–3 mm wide at top of calyx, slightly narrowed at base; limb 5–12 mm diam., the lobes obtuse or notched. Upper 4 anthers at about the same level, their filaments to 4.5 mm long; filament of the 5th stamen 4–10 mm long, inserted in lower half of corolla-tube. Capsule ellipsoid or ovoid-ellipsoid, 5–10 mm long. Seeds C-shaped; testa wrinkled.
Grows mostly in alkaline soils,often in sand overlying limestone, in open, frequently disturbed areas.
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