Photographs: garden, Co.Cork
Unscented yellow flowers with 4 petals, 2-3cm. Sepals striped red. Seed capsules 2-3cm. Self-seeds freely. Erect growth to 1.5m. Identified by Paul Green
Prefers open, well-drained soil, but can grow on heavier, part-shaded ground.
"Intermediate Evening-primrose is a stable derivative of Large-flowered Evening-primrose, O. glazioviana (female) and Common Evening-primrose, O. biennis (male). It is constant in appearance and can occur in absence of parents. Back-crosses can occur." (Stace 1995)
Intermediate Evening-primrose. Self-seeded in garden, Ballingeary, Co.Cork