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| any of several plants of the family Onagraceae | |||
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| a day-flowering biennial or perennial of the genus Oenothera ❲Oenothera fruticosa❳ | |||
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| a coarse biennial of eastern North America with yellow flowers that open in the evening; a coarse biennial of eastern North America with yellow flowers that open in the evening; naturalized in Europe ❲Oenothera biennis❳ |