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Definition of EVENING PRIMROSE
: any of several dicotyledonous plants of a family (Onagraceae, the evening-primrose family) and especially of the type genus (Oenothera); especially: a coarse biennial herb (O. biennis) of North America with yellow flowers that open in the evening
Any of various species of herbaceous plants of the genus Oenothera (family Onagraceae). They are noted for their showy flowers, especially the yellow-flowered biennial O. biennis, which is found widely throughout North America and and has been introduced to Europe. It has been grown by geneticists to determine certain principles of heredity. The true primrose belongs to the family Primulaceae.