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Showy (evening) Primrose; Oenothera speciosa
Photo by Kim Shannon
These perennials range in height from 1-3 feet, with dark green leaves and light pink flowers. This plant is a namesake of its family, the Evening Primrose family (Onagraceae) and is often found in large, spreading colonies. The 4-petaled flower will bloom from spring to mid summer across much of Oklahoma.