Oenothera biennis

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Evening primrose (Oenothera biennis)

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Oenothera biennis

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In evening primrose
…herbaceous plants of the genus Oenothera, of the family Onagraceae, noted for their showy flowers. The name is especially applied to O. biennis (see photograph), which occurs widely throughout North America and has been introduced into Europe. The true primrose belongs to the family Primulaceae.
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