Oenothera cespitosa Nuttall subsp. cespitosa
Oenothera nuttallii Sweet
Oenothera biennis Linnaeus
Oenothera villosa Thunberg subsp. villosa
Oenothera suffrutescens (Seringe) W.L. Wagner & Hoch
Oenothera villosa subsp. strigosa (Rydberg) W. Dietrich & P.H. Raven
Plants and the Blackfoot
Key to plants of the farming and ranching areas of the Canadian prairies, A

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