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EVENING PRIMEROSE
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Evening primrose, Oenothera biennis, family Onagraceae, is a robust, erect, biennial weedy herb. Its roots are large and fleshy, often 5 cm (2 in) in diameter at the crown, and its green or red stems, 0.9-1.2 m (3-4 ft) high, are usually simple or branched. Its yellow flowers open in the evening. A funnel-shaped tube rises from the base to support the sepals and broad petals. Native to the Western Hemisphere, it has been introduced in most of Europe.
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