This section is from the book "British Wild Flowers - In Their Natural Haunts Vol5-6", by A. R. Horwood. Also available from Amazon: A British Wild Flowers In Their Natural Haunts.
This plant occurs by roadsides, in garden rubbish-heaps, and near the seashore, in waste, sandy places. The habit is erect. The stem is shrubby below. The leaves have the lobes each side of a common stalk, wavy, bluish-green, the lobes linear, acute, entire. The flowers are white, with 6 sepals, linear-lance-shaped, with 6 nearly equal petals, 3-fid, longer than the calyx, with a flower-stalk not so long as the latter. There are 4 stigmas, 12-14 stamens. The fruit is oblong, wrinkled. The seeds are rough, kidney-shaped. The plant is 1-2 ft. high, flowering in July and August, and is a herbaceous biennial.