Oenothera contorta Douglas ex Hook. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Myrtales family Onagraceae genus Camissoniopsis species Camissoniopsis cheiranthifolia Name Homonyms Oenothera contorta Douglas ex Lehm. Oenothera contorta Douglas Oenothera contorta Bol. Oenothera contorta Douglas ex Hook.