evening primrose

a plant, Oenothera biennis, having yellow flowers that open at nightfall.
any of various plants of the same or related genera.


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World English Dictionary
evening primrose
any onagraceous plant of the genus Oenothera, native to North America but widely cultivated and naturalized, typically having yellow flowers that open in the evening

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Balance, test-tubes in stands, and a smell of-evening primrose.
The ranch's property boasts a palatial landscape filled with bluebonnets, evening primrose and wild petunias.
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