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Common Evening Primrose Onagraceae (Evening-primrose Family)
Description Distinguishing Features - Leaves: 10 - 20 cm, slightly toothed, lanceolate. Flowers: large, yellow, 2.5 - 5 cm wide; 4 petals; 4 sepals, atop a long, floral tube; stigma cross-shaped. Fruit: an oblong capsule, >2.5 cm long. Habitat Widespread throughout Canada and the United States; in fields and roadsides. Notes The flowers of this night-flowering Evening Primrose open in the evening and usually close by noon.
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A leafy wildflower, growing to a height of 60 - 150 cm.