Article from Bean's Trees and Shrubs Hardy in the British Isles
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'Arctous alpinus' from the website Trees and Shrubs Online (treesandshrubsonline.
A low, procumbent, deciduous shrub a few inches high, shoots glabrous, reddish. Leaves obovate to oblanceolate, narrowed at the base to a slightly flattened stalk, often ciliate, 1⁄2 to 11⁄4 in. long, bright green, shallowly toothed. Flowers in terminal clusters of two to four; corolla urn-shaped, 1⁄5 in. long, with four or five small ciliate teeth; white tinged with pink; anthers chocolate-brown. Fruit a berry-like black-purple drupe about the size of a black currant.
Native of the northern latitudes of Europe, Asia, and N. America. It occurs in a good many mountainous places of Scotland, including Ben Nevis and Ben Wyvis, Skye, Orkney, and Shetland. Its leaves often turn bright red in autumn. The best place for it is a cool damp spot in the rock garden.