GROWISER'S Flowers
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Oenothera elata
Hooker's evening-primrose
Information from USDA Plants Database
http://plants.usda.gov/java/profile?symbol=oeel
https://www.google.com/search?q=Oenothera+elata+Hooker's+evening-primrose&hl=en&source=lnms&tbm=isch&sa=X&ei=C5lKUaCsFYeXiQK0iIHgCg&ved=0CAcQ_AUoAQ&biw=1008&bih=522