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Taraxia tanacetifolia is a species of evening primrose known by the common name tansyleaf evening primrose. It is native to the western United States, particularly the Great Basin and the mountains of the Pacific Northwest. It is a perennial herb growing from a woody taproot and spreading via lateral shoots.
Oenothera harringtonii is a species of flowering plant in the evening primrose family known by the common names Arkansas Valley evening primrose and Colorado Springs evening primrose. It is endemic to the state of Colorado in the United States. [1] It is named for the botanist Harold Harrington. [2]
Oenothera glazioviana is generally a biennial herb producing an erect stem approaching 1.5 metres (4.9 ft) in maximum height. It is roughly hairy in texture, the hairs with reddish blistering or glandular bases. The crinkly leaves are up to 15 centimeters long. The inflorescence is a showy spike of many large flowers.
The primrose moth (Schinia florida) is a common consumer of Oenothera biennis. The adults lay eggs on the flower, and the emerging caterpillars feed on the plant. Pink wing tips reveal Schinia florida in the flower of the evening primrose. Primrose moth, Schinia florida, on an evening primrose, petals have been removed to reveal the insect.
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 villosa, the hairy evening primrose, is a species of flowering plant in the family Onagraceae. [2] It is native to nearly all of the United States (except Hawaii, Alaska, Louisiana, Florida, and South Carolina), and to all Canadian provinces and the Northwest Territories.
Oenothera californica is a perennial herb producing a spreading or upright stem up to 80 centimetres (31 in) long. Young plants have a basal rosette of leaves, while older ones have leaves along the stem, lance-shaped to nearly oval in shape and up to 6 centimeters long.
Oenothera albicaulis is a New World plant in the evening primrose family. It is known by the common names prairie evening-primrose , [ 2 ] white-stem evening-primrose , [ 1 ] whitish evening primrose , [ 3 ] or whitest evening primrose .