Rapid evolution of post-zygotic reproductive isolation is widespread in Arctic plant lineages. - Gustafsson, A Lovisa S; Gussarova, Galina; Borgen, Liv; Ikeda, Hajime; Antonelli, Alexandre; Marie-Orleach, Lucas; Rieseberg, Loren H; Brochmann, Christian (Annals of Botany, 2022)