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The Common Evening Primrose (Oenothera biennis) is a member of the Onagraceae or Evening Primrose family. This is a short-lived biennial or perennial which can grow up to 6-feet tall. The leaves, which grow to 8-inches long, are sessile, sometimes toothed, often wavy on the edges. The plant has flower clusters at the end of a stiff spike with pale yellow tubular flowers that have four petals to 1-inch in length. The flowers open at twilight. This wildflower is found in dry open places throughout the US and southern Canada. It flowers from June to October.