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Oenothera biennis, the common evening-primrose, [3] is a species of flowering plant in the family Onagraceae, native to eastern and central North America, from Newfoundland west to Alberta, southeast to Florida, and southwest to Texas, and widely naturalized elsewhere in temperate and subtropical regions. [4]
Oenothera drummondii, the beach evening-primrose, is a species of flowering plant in the family Onagraceae. [2] It is native to Mexico and the southeastern United States, and it has been introduced to many locations around the world. [1] It is found on coastal dunes and other disturbed sandy areas at elevations below 400 m (1,300 ft). [3]
Oenothera rhombipetala, the four-point evening-primrose, greater four-point evening-primrose, or diamond petal primrose, is a species of flowering plant in the family Onagraceae. [2] It is native to the central United States. [1] A biennial, it is often found alongside roads. [2] It can grow up to 5 feet (1.5 metres) tall. [2]
Oenothera caespitosa at dusk, Convict Lake, Mono County CA. Oenothera caespitosa, known commonly as tufted evening primrose, desert evening primrose, rock-rose evening primrose, or fragrant evening primrose, is a perennial plant of the genus Oenothera native to much of western and central North America, in habitats such as talus slopes and sandy plains. [1]
Oenothera tetraptera, known as fourwing evening primrose, is a species of flowering plant in the evening primrose family native to the Americas. [ 1 ] [ 2 ] It has widely naturalized in other areas, including southern Africa, Europe, Asia, and Oceania.
The main phytochemical in this evening primrose seed oil is gamma-linolenic acid. [21] There is no high-quality scientific evidence that O. biennis or evening primrose oil has any effect on human diseases or promotion of health, [21] [22] and specifically no evidence that it is effective to treat atopic dermatitis or cancer.
Oenothera glazioviana Micheli – red-sepal evening primrose (North America) [67] Oenothera grandiflora L'Hér. – large-flower evening primrose (eastern North America) Oenothera jamesii Torr. & A.Gray – trumpet evening primrose (Mexico, KS, OK, TX) [68] Oenothera longissima Rydb. – long-stem evening primrose (southwestern North America)
Oenothera fruticosa is an evening primrose which stands in a height range of 16-36 inches and is a perennial wildflower. Leaves are alternating and lance-shaped, growing 2-3 inches and pubescent. The stem is straight, pubescent, and ranges in color from red-green. The petals are rounded and 1-2 inches long. Flowering is in spring to early summer.