''Oenothera tetragona'', the glaucous evening primrose, is a species of flowering plant in the family
Onagraceae
The Onagraceae are a family of flowering plants known as the willowherb family or evening primrose family. They include about 650 species of herbs, shrubs, and trees The
Royal Horticultural Society
The Royal Horticultural Society (RHS), founded in 1804 as the Horticultural Society of London, is the UK's leading gardening charity.
The RHS promotes horticulture through its five gardens at Wisley (Surrey), Hyde Hall (Essex), Harlow Carr (Nort ...
considers it a good plant to attract pollinators. There is a cultivar, 'Glaber', also known as 'Clarence Elliott'.