Common Evening-primrose, Eastern Evening Primrose, King's-cureall: Oenothera biennis (Synonyms: Oenothera biennis ssp. centralis, Oenothera biennis var. pycnocarpa, Oenothera muricata, Oenothera strigosa, Oenothera villosa, Oenothera villosa ssp. strigosa) -
Red-sepal Evening-primrose, Red-sepaled Evening Primrose: Oenothera glazioviana (Synonyms: Oenothera erythrosepala, Oenothera Xerythrosepala) -
Common Evening-primrose, Hairy Evening-primrose, Villous Evening Primrose: Oenothera villosa ssp. strigosa (Synonyms: Oenothera rydbergii, Oenothera strigosa) - Included as part of Oenothera biennis in Washington.
Wolf's Evening Primrose: Oenothera wolfii (Synonyms: Oenothera hookeri, Oenothera hookeri ssp. wolfii) -