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 chalk downs. The habit is erect or ascending. The stems are numerous, smooth, or slightly hairy. The radical leaves are long-stalked, oblong, lance-shaped, rarely heart-shaped, scalloped, toothed, the stem-leaves linear, lance-shaped, stalkless. The bracts are short, oblong, linear, acute. The flowers are deep-blue, in round terminal heads, oval in fruit. The calyx-tube is short, with triangular lobes. The corolla-lobes are free to the base at length. The capsule is short, 2- to 3-celled. The stigmas are 3. The plant is 4-15 in. high, flowering in July and August, and is a herbaceous perennial.
The habitat of this Campanula is dry calcareous pastures and downs. The plant is erect. The stem is simple, rounded, angular, short, leafy, slender. The plant is downy. The rootstock is short and stout. The leaves are hoary below, rough, oblong to lance-shaped, scalloped, finely toothed. The radical leaves are long-stalked, oblong, egg-shaped, heart-shaped. The upper leaves are half-clasping, stalkless, egg-shaped, acute. The bracts are egg-shaped, with a long, narrow point, shorter than the flowers. The flowers are bright-blue, erect, stalkless, in a leafy terminal head, with axillary buds below. The central flower opens first. The corolla is funnel-shaped, large, downy. The lobes are bent back and acute. The calyx-tube is short, inversely conical, 5-ribbed, the lobes egg-shaped. The capsule is short, with basal valves. The plant is 2-18 in. high, flowering in July and August, and is a herbaceous biennial.