This section is from the book "Sub-Alpine Plants Or Flowers Of The Swiss Woods And Meadows", by H. Stuart Thompson. Also available from Amazon: Sub-Alpine Plants: Or, Flowers of the Swiss Woods and Meadows.
Caespitose, with numerous tufts of leaves and slender flowering stems. Stems 2-4 inches high, leafy at base, bearing a slender raceme of 1-5 flowers, but more frequently the flowers are solitary. Leaves of barren shoots roundish, coarsely serrate, slightly cordate, much shorter than leaf-stalk, other leaves lanceolate or linear-lanceolate. Usually glabrous. Corolla pale blue, very rarely white, campanulate. Calyx-teeth linear, not one-third length of corolla.
Gravelly, moist places and shifting screes and banks of slaty detritus, especially fond of limestone, up to 9000 feet, but descending beds of streams to the plains; very common. June to September.
Carpathians, Erzgebirge, Eastern, Central, and Western Alps, Vosges, Jura, Pyrenees.
C. pusilla is a very useful plant for the garden, and is grown in borders or rockeries, or even on old walls. It prefers a light, porous, and yet finely divided soil.
Radical leaves orbicular or heart-shaped, but they mostly die away at or before flowering-time; stem-leaves linear or narrow-lanceolate, entire. Stems 6-12 or more inches high, slender, often branched, with a few elegant drooping blue flowers in a loose panicle, or rarely solitary. Corolla-lobes broad and rather short. Capsule ovoid or globular, pendulous. Sepals subulate.
Meadows, walls, rocks, and hilly pastures; common. June, July. It ascends to well above the sub-Alpine region.
Europe, Russian Asia. From the Mediterranean to the Arctic Circle. British Isles.
Very similar to the Harebell and differing chiefly in its long, reflexed calyx-teeth, and the stems are usually 1-flowered.
Clefts of rock from 5000 to 6000 feet in Carniola and Carinthia. June, July.
1. CAMPANULA BARHATA.
2. C. RHOMBOIDALIS.
3. C. PUSHLLA.
4/7 NATURAL SIZE.
Like a large and robust harebell, whose cordate root-leaves also die down early. Flowers larger and often a deeper blue, and usually solitary. Calyx-segments linear-lanceolate or sometimes subulate, erect or spreading. Very variable in size, pubescence, shape, and size of flowers. Some specimens found on the Col de Balme in August, 1911, had flowers 1 1/2 inches across and almost saucer-shaped, the corolla-lobes being very broad and shallow.
Alpine pastures and stony, grassy places up to 9300 feet, and not often seen below about 5500 feet. June to August.
Carpathians, Eastern, Central, and Western Alps; Jura, Pyrenees, Apennines, Sudetic Mountains, Arctic Russia.
A glabrous plant 2-3 feet high, with erect, wiry, simple stem, 1-6 flowered. Leaves serrated, upper ones linear; lower leaves lanceolate, with long petiole. Flowers blue, rarely white, large, broadly campanulate. Calyx-lobes lanceolate, half the length of the corolla. Capsule erect.
Mountain woods and hillside thickets. May to August.
Most of Europe; Western and Northern Asia.
Though widely spread, this species is not often found in large numbers.