Article from Bean's Trees and Shrubs Hardy in the British Isles
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'Vaccinium caespitosum' from the website Trees and Shrubs Online (treesandshrubsonline.
A dwarf deciduous shrub of tufted habit, 4 to 10 in., sometimes only 2 or 3 in. high; branches round, minutely downy or glabrous. Leaves obovate to narrowly wedge-shaped, tapered towards the base, toothed, usually 1⁄4 to 11⁄2 in. long, about half as wide, glabrous and shining. Flowers appearing in May with the young shoots, and produced singly on decurved stalks 1⁄8 in. long. Corolla pitcher-shaped, 1⁄5 in. long, pale pink, five-toothed at the much contracted mouth. Berry globose, about 1⁄4 in. wide, black with a blue bloom, sweet. Bot. Mag., t. 3429.
Native of N. America, spreading across the continent from Labrador to Alaska and southwards to New York on the east, to California on the west, inhabiting mountain summits at its more southerly limits. Introduced in 1823. It is a neat little shrub, very suitable for the rock garden.