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Oenothera versicolor, the red evening-primrose, is a species of flowering plant in the family Onagraceae, native to South America, from Peru and Ecuador down to Bolivia and Northern Argentina [2] This species is not as common in cultivation as other members of the genus but popular cultivars including 'Sunset Boulevard' are grown in gardens around the temperate world as the plant is hardy down ...
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.
Because the evening primrose is a light-dependent germinator, it is important that the seeds are not planted too deep into the soil, about 0.5–1.0 centimetre (0.2–0.4 in) deep. The cultivation of evening primrose is thus suitable for no-till farming , but the plants require an intense mechanical weed control.
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 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 macrocarpa (syn. Oenothera missouriensis), the bigfruit evening primrose, [1] Ozark sundrops, [2] Missouri evening primrose, [3] or Missouri primrose, [4] is a species of flowering plant in the evening primrose family Onagraceae, native to northeast Mexico and the south-central United States, where it is found in calcareous prairies and limestone outcrops.
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 perennis is a species of flowering plant in the family Onagraceae and is native to the eastern United States and Canada. [1] [2] Its common names include little evening primrose, [3] small sundrops, [4] and small evening primrose.