Phyllodoce caerulea, known as blue heath in British English[3] and purple mountain heather[4] or blue mountainheath[5][6] in American English, is an evergreen species of dwarf shrub that grows up to around 15 cm (6 in) tall, and bears clusters of 2–6 purple flowers.

Phyllodoce caerulea is a low shrub, typically growing 5–15 centimetres (2–6 in) high, and exceptionally reaching 25 cm (10 in).

It was first discovered around a spring at an altitude of 740 metres (2,430 ft) on the slopes of the Sow of Atholl, but has since been found at a few sites in the Ben Alder forest.

[1] The species has not been observed on the Faroe Islands, Jan Mayen, Bjørnøya, Svalbard or Franz Josef Land.

[1] In North America, P. caerulea is found in coastal Alaska, the Northwest Territories, Quebec and Labrador, as well as scattered sites in the Gaspé Peninsula and the White Mountains of New Hampshire and Vermont.