A mat-forming montane perennial herb which grows in similar habitats to C. arcticum, but on more strongly basic rocks. It is particularly abundant on soft mica-schists but also occurs on limestone and, rarely, serpentine. It often occurs in species-rich dwarf-herb communities. From 300 m on Seana Bhraigh (E. Ross) to 1210 m on Ben Lawers (Mid Perth).
A montane, tufted perennial herb of acidic and hard basic rocks. It normally occurs in wet, thinly-vegetated crevices and on ledges in N.-facing corries, but has been recorded on a montane fell-field on Skye. Plants may sometimes be found rooted at the foot of mountain cliffs. It is rarely found below 700 m and reaches 1200 m on Ben Nevis (Westerness).
This perennial grows mainly on dry, calcareous to slightly acid, sandy soils, occurring in pastures, on dry roadsides, wayside banks, the margins of arable fields, sandy or gravelly waste ground, sand dunes and sand-pits. 0-300 m (Hounam Law, Roxburghs.).
An annual of dry, calcareous, open grassland and railway banks. Seed is freely produced but is poorly dispersed, with colonies appearing in the same place year after year. Lowland.
A straggling, mat-forming montane perennial herb that grows on wet acidic rocks, often in areas of late snow-lie. It is usually found above 750 m and reaches an altitude of 1220 m on Ben Macdui (S. Aberdeen), but occurs at 335 m near Mar Lodge (S. Aberdeen).
An annual of light, dry, sandy or gravelly soil. Coastal habitats include open grassland, fixed dunes, sandy banks and sheltered rock crevices. Inland, it occurs in a range of open habitats, including dry grassland, by paths, on wall-tops, road verges and railway ballast. 0-455 m (Dalnaspidal, E. Perth).
A tufted or mat-forming perennial herb found in a wide range of, usually fertile, habitats including neutral pastures and meadows, calcareous and acidic grassland, fen-meadows, rush-pastures, heaths and mires, springs and flushes, montane grassland, rocks and ledges, sand dunes and shingle, cultivated ground, waste places and walls. 0-1220 m (Aonach Beag, Westerness).
This short-lived perennial herb is known only from Meikle Kilrannoch in Angus, where it occurs principally amongst serpentine debris on exposed montane fell-field; also in montane heath dominated by Empetrum nigrum subsp. hermaphroditum and Vaccinium myrtillus, and rarely in Nardus stricta grassland. The altitude is c. 860 m.
C. glomeratum grows in disturbed areas, often in places where there is some nutrient enrichment. It is fairly tolerant of trampling and is particularly common around farms, in gateways, on field edges, in bare patches in improved grassland, beside tracks and in waste places. It is also frequent on sand dunes and shingle. 0-610 m (Black`s Hope, Dumfriess.).
A tufted perennial herb confined to two adjacent hills on very exposed, sparsely-vegetated fell-field of shattered serpentine rock. Although it grows to an altitude of only 80 m, the habitat has many similarities to more montane communities.