evening primrose

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Related to Oenothera biennis: Oenothera fruticosa, evening primrose

evening primrose

n.
Any of various plants of the family Onagraceae and especially the genus Oenothera of the Americas, having four-petaled usually yellow flowers that open in the evening and whose seeds yield an oil used in herbal medicine.

evening primrose

Herbal medicine
A biennial herb that contains essential fatty acids, including gamma linoleic acid; it is has been widely used for heart disease, hypercholesterolaemia, premenstrual syndrome, endometriosis, breast pain, menopause, eczema, psoriasis, acne, osteoporosis, multiple sclerosis, cancer, Alzheimer's disease, asthma, diabetes, hyperactivity and gastrointestinal disorders.

There are no peer-reviewed studies to support the efficacy of evening primrose.

Toxic effects
Headaches, nausea, seizures, skin rashes.
References in periodicals archive ?
Seed yield, oil content and fatty acid composition of Oenothera biennis L.
Oenothera biennis (Oenotheraceaeou Onagraceae):onagre.
Barbarea vulgaris, Cichorium intybus, Daucus carota, Draba verna, Erigeron annuus, Leucanthemum vulgare, Oenothera biennis, Pastinaca sativa, Penstemon digitalis, Solidago spp.
By the end of July, species in this habitat include Agrimonia rostellata (woodland agrimony), Chasmanthium latifolium (spangle grass), Helianthus divaricatus (woodland sunflower), Lobelia inflata (Indian tobacco), Oenothera biennis (evening primrose), Polygonum virginianum (Virginia knotweed), Silene stellata (starry campion), and Verbena urticifolia (white vervain), to name the most conspicuous.
pilosus, Cirsium discolor, Euthamia graminifolia, Oenothera biennis, Solidago canadensis, and Vernonia gigantea.