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Salix herbacea, the dwarf willow, least willow or snowbed willow, is a species of tiny creeping willow (family Salicaceae) adapted to survive in harsh arctic and subarctic environments. Distributed widely in alpine and arctic environments around the North Atlantic Ocean , it is one of the smallest woody plants .
The Arctic willow is a food source for several Arctic animals. Muskoxen, caribou, Arctic hares, and lemmings all feed on the bark and twigs, while the buds are the main food source of the rock ptarmigan. It is the primary host plant and food source for the Arctic woolly bear moth (Gynaephora groenlandica). [10]
In northern Greenland, the ground is covered with a carpet of mosses and low-lying shrubs such as dwarf willows and crowberries. Flowering plants in the north include yellow poppy, Pedicularis, and Pyrola. [2] [3] Plant life in southern Greenland is more abundant, and certain plants, such as the dwarf birch and willow, may grow several feet high.
Arctic vegetation is largely controlled by the mean temperature in July, the warmest month. Arctic vegetation occurs in the tundra climate, where trees cannot grow.Tundra climate has two boundaries: the snow line, where permanent year-round snow and ice are on the ground, and the tree line, where the climate becomes warm enough for trees to grow. [7]
Salix polaris, the polar willow, is a species of willow with a circumpolar distribution in the high arctic tundra, extending north to the limits of land, and south of the Arctic in the mountains of Norway, the northern Ural Mountains, the northern Altay Mountains, Kamchatka, and British Columbia, Canada. [1] [2] [3] [4]
In the Southern Arctic tundra, shrubs are more regular, consisting of dwarf birch, Arctic willow, northern Labrador tea, Dryas spp., and Vaccinium ssp. In waterlogged areas, moss, willow and sedge cover is substantial. [22] Invasive species, such as the Kentucky blue grass, orchids, Red fescue and flax proved to be unsuccessful.
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Most of the birch is shrub-like and under 2 meters tall. About 2% of the forest features trees 8-12 meters tall, mostly in valleys in the north, east and south. Besides birch, there are some stands of rowan (Sorbus aucuparia) and tea-leaved willow (Salix phylicifolia). Lake Skorradalsvatn, in western Iceland