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Cerastium arcticum, the Arctic mouse-ear chickweed or Arctic mouse-ear, is a flower distributed at parts of western and southern Greenland, Baffin Island, Labrador, Iceland, Scotland, Norway and Svalbard.
It grows in tufts, sometimes loosely, generally in damp places and on open gravel. Most of the plant is pubescent, the hairs appearing stiff. Leaves are elliptical. The flowers are white, rather large, beautiful when fully expanded, single or two together. Petals deeply notched and considerably longer than sepals.