Erect, medium sized, 10-70 (100) cm long, annual-perennial herb. Leaves petiolate-sessile, variously shaped, amplexicaule, glabrous. Inflorescence solitary axillary, terminal or umbellate, bracts sessile, ovate-lanceolate. Flowers tetramerous, campanulate, pedicellate, variously coloured: blue, purplish, white, spurred. Stamens adnate to corolla lobes, anthers versatile. Ovary sessile, elliptic - ovate, stigma sessile - subsessile, papillose. Capsule 10-25 seeded, dehiscing nearly to the base, seeds small, up to 2 mm long, reticulate or granular.