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 wet subalpine limestone rocks, limestone covered with grass, peaty pastures. The habit is prostrate. The plant is tufted, stoloniferous. The aerial stems are rooting, ending in a tuft of leaves, with scapes 1-flowered, with 1 or 2 leaves only, curved or ascending. The leaves are ovate, oblong, the radical ones forming a rosette, blunt or more or less acute, 1-nerved, the stem-leaves oblong, few, smaller. The flowers are large, bright-blue, solitary, not stalked. The bracts are leafy. The calyx bears 2 bracts, with 5 equal, sharp, teeth or lobes, 5-winged, with prominent angles, the tube larger. The corolla is salver-shaped, 5-cleft, the lobes ovate, blunt, with small intermediate lobes, which are divided into 2 nearly to the base, and the throat is naked, with a scale between the lobes. The capsule is nearly stalkless. The plant is 1-3 in. high, flowering from April to June, and is a herbaceous perennial.
The habitat of this species is summits of Scottish mountains. The plant has the rosette habit more or less. The stems are slender, branched or simple, erect. The radical leaves are few, inversely ovate, oblong, elliptic, blunt or acute. The stem-leaves are smaller, in distant pairs, 3-5-nerved. The flowers are bright light-blue, solitary or few, shortly-stalked. The small bracts are oblong. The calyx is cylindrical, narrow to bell-shaped, with 2 bracts, the 5 awl-like lobes equal, 5-angled or keeled, and ribbed. The corolla is funnel-shaped, 5-cleft, the lobes ovate, blunt, with small, intermediate, bifid scales, the throat naked. The capsule is more or less stalk-less. The plant is 1-6 in. high, flowering in July and August, and is a herbaceous annual.