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UMass Extension Weed Herbarium
 

Common Name: common eveningprimrose
Scientific Name: Oenothera biennis L.
Family Name: Onagraceae - Evening Primrose Family

Identification Notes:

life cycle - native biennial, reproducing by seed

stems - upright, second year, leafy, often purple or reddish, often branched above only growth habit 1, growth habit 2, growth habit 3, growth habit 4, stems, winter habit

leaves - first year basal leaves, elliptic to lanceolate, wavy margins, prominent white mid-vein, basal rosette; second year stem leaves, alternate, smaller with height, sessile leaves 1, leaves 2, leaves 3, leaves 4

flowers - 4-petaled, bright yellow, stigma X-shaped, sepal turned down against stem; axillary and terminal above; long flowering period, flowers open late afternoon and evening flowers

seedpods - capsule, upright, hairy seedpods

Images:

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Oenothera biennis thumbnail 5 Oenothera biennis thumbnail 6 Oenothera biennis thumbnail 7 Oenothera biennis thumbnail 8
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Oenothera biennis thumbnail 9 Oenothera biennis thumbnail 10 Oenothera biennis thumbnail 11 Oenothera biennis thumbnail 12
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