Photographs: Ballingeary, Co. Cork

Des Etangs' St. John's-wort Hypericum x desetangsii (Hypericum maculatum x perforatum) Family: Hypericaceae Flowering time: June-September. Perennial. Native. Fertile hybrid between Perforate St.John's-wort and Imperforate St.John's-wort. Variously intermediate between parents and can occur in their absence. Oval leaves with few translucent veins, translucent dots very few or absent. Small black dots along undersides of leaf margins. Stems round in cross-section with 2 or 4 raised ridges. Damp grassland, roadsides, railway embankments. Has not been nationally mapped and is probably very under-recorded except in Waterford and Wexford. Identification confirmed by Paul Green BSBI

Hybrid St.John's-wort, Hypericum x desetangsii