Oenothera speciosa, Showy Evening Primrose, Pink Evening Primrose.

Oenothera speciosa, Showy Evening Primrose, Pink Evening Primrose, was first described by Thomas Nuttall from collections along the Red River in Arkansas in 1819. It was grown iat the University of Philadelphia in 1821 from seeds collected by Nuttall. Plants were offered for sale at Bartram's Garden in Philadelphia by at least 1828. A recent study (2009) found that an 80% aqueous methanol extract had significant antiphyperglycemic, anti-inflammatory and antioxidant activity. The plant contains various flavonol glycosides, a novel biflavonol (speciin), and various phenolic metabolites including myricitrin and hyperin.

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