Onagraceae

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Onagraceae A family of shrubs and herbs that have tetramerous (or, rarely, dimerous) flowers, with twice as many stamens as petals, and an inferior ovary of 4 fused carpels and 4 cells. Many members are now grown for ornament, e.g. Oenothera and Fuchsia. There are some 24 genera, comprising about 650 species, with a cosmopolitan distribution, especially in America.