This section is from the book "British Wild Flowers - In Their Natural Haunts Vol2-4", by A. R. Horwood. Also available from Amazon: A British Wild Flowers In Their Natural Haunts.
This ericetal plant has been found in the Clyde Beds at Garvel Park, of Late Glacial age. Its present distribution is the N. Temperate Zone of Europe, N. Asia, N. Africa, and the Himalayas. It is found in all parts of Great Britain except the Shetlands, as far north as the Orkneys, ascending to 1200 ft. in the Highlands. It is native in Ireland as well as the Channel Islands.