Onagraceae - evening-primrose family

Gerald A. Mulligan (Agriculture Canada, Ottawa, retired) 1600 Apeldoorn Ave., Ottawa, Ontario, Canada, K2C1V5 Oenothera biennis L., yellow evening-primrose, onagre bisannuelle Biennial, spreading by seeds; forms a flat rosette the first year; stems 2 to 6 feet (6 to 18 dm.) high; flowers yellow; throughout, but most common in the east; pastures, waste places, and roadsides; native to North America. Click on a photo to view an enlarged image. Weed Name Photo Weed Name Photo yellow evening-primrose, onagre bisannuelle yellow evening-primrose, onagre bisannuelle (winter) yellow evening-primrose, onagre bisannuelle (flowers and fruit) yellow evening-primrose, onagre bisannuelle (fruit) yellow evening-primrose, onagre bisannuelle (seedling)