Hypericum undulatum var. undulatum (Nomenclature)
Plant erect. Leaves (3-)4-14(-18) mm broad, elliptic to ovate, margin crisped-undulate. Petals red-tinged dorsally.
0-1750 m.
Distribution of the species except extreme south Spain. The record for Ireland (co. Cork) is based on a specimen in K and that for France (Brittany) on a specimens of a Lloyd collection in BM and ANG. The former, from Glengarriff, could just possibly be due to mislabelling, but the latter appears to be a correct record. Both collections were misidentified, the former as H. tetrapterum and the latter as H. desetangsii. Lloyd, in Fl. Ouest France 5th ed., cites several localities round Brest for H. desetangsii, his description of which agrees with H. undulatum, not H. ´desetangsii. It seems, therefore, that the 'Atlantic' distribution of H. undulatum includes (or included) the extreme 'Atlantic' part of France and possibly SW. Ireland.