Oenothera tetraptera, known as fourwing evening primrose, is a species of flowering plant in the evening primrose family (Onagraceae) native to the Americas. It has widely naturalized in other areas, including southern Africa, Europe, Asia, and Oceania.
Oenothera tetraptera was first formally named by Spanish botanist Antonio José Cavanilles in 1796. It is an annual or short-lived perennial herb growing tall. The four-petaled, white flowers open around sunset. Each petal grows up to in length and the flowers change from white to pinkish purple as they age. The fruit is a hairy, obovoid capsule, 7âÂÂ18 mm in length with wings 2âÂÂ3 mm wide on the valves, for which the species was named.