Abstract
Erica mackayana occurs only in western Ireland and N Spain. In Ireland, where it spreads only by cuttings, it has a very disjunct and localised distribution. Erica tetralix , however, is very common and where Erica mackayana occurs, the hybrid E. x stuartii , is frequent, though never more than 1–2 km from Erica mackayana. The restricted distribution in Ireland of parent and hybrid raises questions as to their origin. Like Erica erigena , Erica mackayana may have been introduced from Spain by traders as packing for goods; the remote location of the sites suggests it may even have arrived with smugglers.
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