This is an annual species with very acrid and blistering juice. It grows throughout the same general range as the small-leaved species, and is about the same height. It is found from June to August. It is common in wet woodlands and ditches, and may be easily distinguished by its large, hooked seed cases, which are grouped in a conspicuous cluster. The stalk is thick and hollow, the leaves are thickish, and the pale flowers are small, with inconspicuous petals.