Flower and flowerbuds. Goslar, Germany. Wild. 2005-09-20.

Oenothera macrocarpa Nutt.
Engl.: bigfruit evening-primrose, Ozark sundrops.
Deu.: Missouri-Nachtkerze.
Suom.: isohelokki.
Sven.: storblommigt nattljus.
Bot. syn.: Oenothera fremontii S. Wats., Oenothera missouriensis Sims