Photo: Oenothera macrocarpa 2.

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
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Photo: Oenothera macrocarpa 2.