Hypericum undulatum, Schousboe ex Willd.

52. H. undulatum Schousboe ex Willd. , Enum. Pl. Hort. Berol. 810 (1809).

Stems 15-100 cm, erect from a decumbent and rooting base, narrowly 4-winged. Leaves 7-40 mm, narrowly ovate to elliptical or narrowly oblong, sessile, with medium or small translucent dots; margin usually markedly undulate. Sepals lanceolate, acute or acuminate, entire, with 3-14 superficial black dots. Petals (7-5-)8-10 mm, without or with a few marginal or superficial black dots, usually red-tinged. Damp places. S. W. Europe, northwards to Wales. Az Br Ga Hs Lu. In Spain and N. Portugal plants are found with characters or combinations of characters intermediate between 51 and 52. As it is uncertain whether or not such plants are of hybrid origin, it seems best to include them at present in H. undulatum as var. boeticum (Boiss.) Lange ( H. boeticum Boiss. ).