Pioneer vegetation on acidic shallow soils of the winter-mild atlantic and subboreal regions of Western Europe, the Northern Iberian Peninsula and Madeira
Thero-Airion Tx. ex Oberd. 1957
Thero-Airion Tx. ex Oberd. 1957
sed04 | Rivas-Martínez et al. (1999, 2002b: 499) prefer classification of this alliance within the Mediterranean Helianthemetalia guttatae. E. Bergmeier supports this view as well while L. Mucina and J. Dengler disagree.