In the first year the leaves form a rosette. In the second year the stem extends from the rosette and leaves are alternate along it. The inflorescence is a raceme which may be branched. The flowers are usually yellow, but occasionally white, only slightly zygomorphic. There are 5 stamens, some or all of the filaments are hairy. The fruit is capsule. The glands in the upper part of the plant are characteristic.

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Waste ground, rough grassland, field-borders and waysides; also in old quarries and gravel-pits.

In flower during June, July, August and September.

A biennial, occasionally annual, herb.

Scarce in Britain, with most records coming from central and southern England. Occurrences are generally casual, but some populations appear to be persistent.

Rare in Leicestershire and Rutland.