Cerastium alpinum subsp. alpinum
Plants perennial, tufted, forming clumps or mats, taprooted, stoloniferous, rarely rhizomatous. Flowering shoots usually erect from decumbent base, 6–20 cm. Leaves: flowering shoots with blades narrowly elliptic or lance-elliptic to oblanceolate, apex ± acute, evenly, but not densely pubescent; those near base and on sterile shoots not marcescent, blade oblanceolate to obovate, apex round. Inflorescences (1–)2–4 flowered. Pedicels usually long, slender, divaricate in well-grown plants. Petals 1.5–2 times as long as sepals. 2n = 72, 108.
Phenology: Flowering spring.
Habitat: Low-arctic tundra, cliff ledges, talus
Elevation: 0-300 m
Greenland, Man., Nfld. and Labr., N.W.T., Nunavut, Ont., Que., Sask., n Europe (Scandinavia).