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.
The habitat of this plant is copses, stony hedgebanks, and thickets. The habit is the rosette habit. The fleshy leaves check transpiration, and the succulent tissue is adapted to drought. The leaves are wedge-shaped at the base, and the stalks are very short. The leaves are toothed, oblong, lance-shaped. The plant is more slender than 5. Telephium (see Volume V, Section XII). The flowers are purple, in a dense corymb, the petals are spreading. The carpels are not furrowed. The plant is 6-24 in. in height. It flowers in August, and is a herbaceous perennial.