Silene acaulis, known as moss campion[2] or cushion pink, is a small wildflower that is common all over the high arctic and tundra and in high mountains of Eurasia and North America (Alps, Carpathians, southern Siberia, Pyrenees, British Isles, Iceland, Faroe Islands, Greenland, Rocky Mountains).

The dead leaves from the previous season persist for years, and pink flowers are borne singly on short stalks that may be up to 2.5 centimetres (1 inch) long, but are usually much shorter.

[13] Moss campion is common all over the high arctic and the higher mountains of Eurasia and North America (south to the Alps, Carpathians, southern Siberia, Pyrenees, British Isles, Iceland, Faroe Islands, Rocky Mountains).

[10] Range: It inhabits alpine fellfield, on windswept rocky ridges and summits above treeline.

With the cushions it produces its own, warmer climate with higher temperatures inside, when the sun shines.

[14] Experimental warming has been shown to start flowering substantially earlier than control cushions experiencing ambient temperature.

Furthermore, vital rates such as growth, survival, and fruits per area were shown to increase in moderately warmer years yet declined in the very warmest years, suggesting that a change in climate into warmer conditions or more frequent unusually warm summers may eventually lead to negative impacts.

[16] Another study showed that, while the short term responses were positive, they turned negative on medium-term, suggestion that moss campion may be at risk in future global warming.

[17] Projections produced under different climate scenarios suggest that S. acaulis will likely face climate-driven fast decline in suitable areas on the British Isles and across North America, and that upward and northward shifts to occupy new climatically suitable areas are improbable in the future.

[20] The raw root skin plants were consumed as a vegetable in Iceland and in Arctic regions.