Oenothera biennis
Oenothera biennis · Accepted scientific name
Scientific literature: Very Sparse (2 studies) · ★☆☆☆☆
Oenothera biennis, commonly known as evening primrose, is a versatile plant utilized for its medicinal potential across various biological activities. The roots, seeds, and leaves contain key chemical compounds such as gallic acid and oenothein A. Various preparations, including oils and evening primrose oil (EPO), are studied for their roles as antitumor, 5-alpha-reductase, and 5-lipoxygenase inhibitors. Research suggests these components may influence conditions such as fibroadenomas, gestational diabetes, and cervical ripening or dilation. This plant remains a significant subject of interest due to its complex biochemical profile and therapeutic applications.
- Synonyms
- Oenothera Biennis Var. Rubricaulis · Oenothera Biennis Var. Pycnocarpa · 111 more
- Common names
- Not available
- Family
- Onagraceae
- Distribution
- Not available
- Plant Parts
- Root · Seed
Classification
Common Names
Oenothera biennis is a versatile plant known by many different names across various cultures and regions. In English-speaking areas, it is most frequently recognized by its common name, the common evening primrose. However, its linguistic reach extends much further, as seen in the Welsh name Briallu yr Hwyr. It is also referred to by several other regional monikers, including Bella de nit and Canárias. Furthermore, in certain locales, this beautiful species is affectionately called Cirio-do-norte.
Sources: Catalogue of Life (COL)
Synonyms
Oenothera biennis is a complex botanical subject that is frequently identified through various taxonomic synonyms. Historically, the plant has been classified under the name Brunyera biennis in certain scientific records. Researchers also recognize several distinct forms, including Oenothera biennis f. leptomeres and the variety known as Oenothera biennis f. muricata. Furthermore, the classification extends to specialized types such as Oenothera biennis f. nanella and the subvariety Oenothera biennis subf. latifolia. Understanding these diverse nomenclatures is essential for accurately documenting the plant's many morphological variations.
Sources: The World Checklist of Vascular Plants (WCVP)
Taxonomy
Oenothera biennis is a fascinating member of the kingdom Plantae that showcases the diverse complexity of the natural world. Within this vast kingdom, the species is classified under the class Equisetopsida. It belongs to the order Myrtales, placing it in a specific evolutionary lineage. Further narrowing its identity, the plant is situated within the family Onagraceae. Finally, it is categorized under the genus Oenothera, completing its unique botanical profile.
| Rank | Classification |
|---|---|
| Kingdom | Plantae |
| Phylum | Streptophyta |
| Class | Equisetopsida |
| Subclass | Magnoliidae |
| Order | Myrtales |
| Family | Onagraceae |
| Genus | Oenothera |
Sources: The World Checklist of Vascular Plants (WCVP)
Distribution
Geographic Regions
Oenothera biennis exhibits a wide-ranging distribution that spans across several key regions of Africa and the Macaronesian islands. Its presence is notably documented within the archipelago of the Canary Islands and the lush landscapes of Madeira. Within the African continent, the species can be found throughout the Northeast Tropical region, specifically in Ethiopia. The plant also thrives across Northern Africa, establishing itself in the diverse climates of both Algeria and Morocco. This broad geographical spread highlights the remarkable adaptability of the species across various Mediterranean and tropical environments.
Sources: The World Checklist of Vascular Plants (WCVP)
Identification
Morphology
Oenothera biennis is a self-supporting herb that exhibits a versatile range of physical characteristics. Depending on its environment, this plant can grow as small as 0.1 meters or reach a maximum height of 2 meters. Many specimens typically achieve a more substantial stature, often exceeding a minimum height of 1.079 meters. This flexibility in size allows the species to adapt effectively to various ecological niches. Ultimately, its robust growth form ensures it remains a prominent fixture in its natural habitat.
Sources: Global Inventory of Floras and Traits (GIFT)
Biological Activities
Oenothera biennis is a plant species that possesses significant pharmacological potential due to its diverse biological activities. Research indicates that constituents such as gallic acid, isolated from its roots, exhibit measurable antimicrobial properties. Furthermore, the plant has been identified as a source of oenothein A, a trimeric hydrolyzable tannin found within its leaves. This specific compound is notable for its demonstrated antitumor activity in scientific studies. Together, these findings highlight the therapeutic value of the plant's chemical profile in combating various diseases.
Compounds
Oenothera biennis, commonly known as evening primrose, serves as a rich source of several significant bioactive compounds. Phytochemical analyses of the plant reveal the presence of key polyphenols and flavonoids, including epicatechin and coumaric acid. Research also highlights the inclusion of gallic acid, often referred to in scientific literature as GA, which contributes to the plant's notable anti-inflammatory properties. Furthermore, the leaves of the plant have been found to contain oenothein A, a trimeric hydrolyzable tannin. Together, these diverse chemical constituents support the traditional medicinal uses of the species.
Conditions
Oenothera biennis is identified as an herbal medicine used for the management of menopausal symptoms, though evidence for its efficacy remains inconclusive. Research indicates that gallic acid isolated from its roots possesses antifungal activity against Alternaria alternata, despite also causing phytotoxicity in wheat seeds. This plant is listed among several medicinal plants that show positive effects in the management of symptoms related to Multiple Sclerosis. Regarding infectious diseases, extracts of Oenothera biennis demonstrated weak or no antimicrobial activity against Neisseria gonorrhoeae isolates. Finally, studies on adolescent girls show that evening primrose oil can help regulate irregular menstrual cycles and improve hormonal levels in patients with PCOS.
Preparations
Oenothera biennis is frequently prepared as oil, specifically in the form of evening primrose oil (EPO). This valuable fixed oil is extracted from the seeds to provide essential fatty acids for various health applications. In addition to these oil preparations, the plant is also prepared as leaves for the isolation of specific compounds like oenothein A. The various components of the species can also be studied through the analysis of its general plant material. These diverse forms of preparation allow for the extraction of bioactive substances used in both medicinal and nutritional contexts.
Parts used
Oenothera biennis is a versatile medicinal herb that contains various bioactive compounds distributed throughout its different anatomical parts. Research into the plant's root has identified anti-inflammatory components like gallic acid that may assist in managing conditions such as arthritis. The seeds of the species are also highly significant, serving as a potent source of aldose reductase inhibitors and essential omega-6 fatty acids. Furthermore, specific tannins like oenothein A have been successfully isolated from the leaves of the plant. Together, these diverse parts demonstrate why this species is such a valuable subject for both traditional medicine and modern pharmaceutical study.