Oenothera trichocalyx Nutt. ex Torr. & A.Gray Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Myrtales family Onagraceae genus Oenothera species Oenothera pallida Name Homonyms Oenothera trichocalyx Nutt. Oenothera trichocalyx Nutt. ex Torr. & A.Gray