Oenothera gracilis Schrad. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Myrtales family Onagraceae genus Oenothera species Oenothera perennis Name Homonyms Oenothera gracilis (Phil.) H.Lév. Oenothera gracilis Schrad. ex Fisch. & C.A.Mey. Oenothera gracilis Schrad.