Oenothera dubia Steud. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Myrtales family Onagraceae genus Oenothera species Oenothera tetraptera Name Homonyms Oenothera dubia E.H.L.Krause Oenothera dubia Steud.