Evening primrose is a tall plant with yellow flowers that open in the evening. Its seeds are used to make medicine.
evening primrose in British English
noun
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
evening primrose in American English
any of a genus (Oenothera) of plants of the evening-primrose family, with yellow, pink, or white flowers, many of which open in the evening
evening-primrose in American English
(ˈivnɪŋˈprɪmˌroʊz)
adjective
designating a family (Onagraceae, order Myrtales) of dicotyledonous plants found chiefly in temperate America, including the fuchsia, sundrops, and willow herbs