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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How to use evening primrose in a sentence
In another locality I might have brought him dwarf cornel, or the houstonia, or wood-sorrel, or the evening-primrose.Under the Maples | John Burroughs
British Dictionary definitions for 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 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012