evening prim rose

evening primrose

noun
1.
a plant, Oenothera biennis, having yellow flowers that open at nightfall.
2.
any of various plants of the same or related genera.

Origin:
1800–10

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
evening primrose
 
n
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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