Calluna

Calluna vulgaris, common heather, or simply heather, is the sole species in the genus Calluna in the flowering plant family Ericaceae. It is the dominant plant in most heathland and moorland in Europe.
Calluna is separate from the closely related genus Erica. Calluna probably comes from the Ancient Greek Kallyno (καλλύνω), "beautify, sweep clean", in reference to its traditional use in besoms. Calluna is differentiated from Erica by its corolla and calyx each being in four parts instead of five.
Calluna is extremely cold-hardy, surviving severe exposure and freezing conditions well below −20 °C (−4 °F). It is native to Europe, Iceland, the Faroe Islands, and the Azores. It has been introduced into many other places worldwide with suitable climates, including North America, Australia, New Zealand and the Falkland Islands.
From Wikipedia, the free encyclopedia.