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Keys
Vascular plant groups
Club mosses
Ferns
Vegetative key to families
Gymnosperms
Flowering plants
Genera
Families
Onagraceae
Stamens twice as many as the petals
Onagraceae
consider the other alternative
Floral
tube extending above the
ovary
. Sepals 4
Oenothera
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Corolla
yellow sometimes tinged bronze-red with age
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reject this alternative
Flowers up to 1.5 cm diam
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reject this alternative
Flowers more than 2 cm diam