evening primrose
noun
                                
              
          
                                                      : any of several dicotyledonous plants of a family (Onagraceae, the evening-primrose family) and especially of the type genus (Oenothera)                                      
                
                                
            especially                
          
                                                      : a coarse biennial herb (O. biennis) of North America with yellow flowers that open in the evening                                      
            
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  Merriam-Webster unabridged




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