Distribution of the sampled populations of E. andevalensis and E. mackayana A Erica mackayana populations (as in Fagúndez and Díaz-Tapia 2023) sampled in NW Iberian Peninsula B Erica mackayana populations (as in Fagúndez and Díaz-Tapia 2023) sampled in Ireland C Erica andevalensis populations sampled. The distribution of E. andevalensis is represented in a 5×5 UTM grid from https://www.ideandalucia.es/catalogo/inspire/srv/api/records/625a6b54-bfc1-4589-8571-b4503bf262c2 (Spain) and Carapeto et al. (2020) (Portugal) D location of the three studied regions in Europe.