Oenothera biennis

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Oenothera biennis
File:Oenothera biennis 20050825 962.jpg
Scientific classification
Kingdom: Plantae
Division: Magnoliophyta
Class: Magnoliopsida
Order: Myrtales
Family: Onagraceae
Genus: Oenothera
Species: O. biennis
Binomial name
Oenothera biennis
L.

Oenothera biennis (Common evening primrose or Evening star), is a biennial flowering plant growing to 1.2 m (3 to 4 ft), with easy germination. It is also known as Weedy evening-primrose, German rampion, hog weed, King's cure-all, and fever-plant.

Its hermaphrodite, pale yellow flowers bloom for most of the summer, from June to September. They open in the evening, hence the name "evening primrose", and are pollinated by Lepidoptera (Moths and Butterflies) and bees.

The mature seeds contain approximately 7-10% gamma-linolenic acid, a rare essential fatty acid. The O. biennis seed oil is used to reduce the pains of premenstrual stress syndrome and is beneficial to the skin of the face.[citation needed] Also, poultices containing O. biennis were at one time used to ease bruises and speed wound healing.[citation needed]

The flower has an unusual response to ultraviolet light [1]. A brilliantly colored center, invisible in visible light, is boldly apparent under ultraviolet.

References

  • Blanchan, Neltje (2005). Wild Flowers Worth Knowing. Project Gutenberg Literary Archive Foundation. Check date values in: |year= (help)

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