Annual, biannual or perennial herbs, usually with simple hairs; stems erect, branched or unbranched. Leaves petiolate, becoming sessile up the stem, ovate to cordate, coarsely dentate. Inflorescence a corymbose raceme, elongating in fruit. Sepals erect, dimorphoic; petals clawed, violet, purple, lavender, or rarely white; stamens 6. Fruit oblong to suborbicular, flattened, less than 3 times as long as broad, pendulous, dehiscent, with broad septum; style linear, stigma 2-lobed; valves with indistinct reticulate venation; seeds in 2 rows per locule, flattened, usually winged.
3 species from Europe, 1 species naturalised in Australia.