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Family Onagraceae

Description: Annual or perennial herbs, shrubs [or rarely trees].

Leaves alternate, opposite or whorled, simple, entire, toothed [or pinnatifid]; stipules minute or absent.

Inflorescences usually terminal spikes or racemes, or flowers solitary and axillary. Flowers actinomorphic or zygomorphic, usually bisexual, mostly 4- or 5-merous, hypanthium often extended above ovary. Sepals valvate, often caducous. Petals usually conspicuous, occasionally absent. Stamens mostly twice as many as sepals; anthers basifixed or versatile, longitudinally dehiscent. Ovary inferior, usually 4- or 5-locular; stigma capitate or lobed.

Fruit usually a capsule, sometimes a berry or nut; seeds, usually numerous, sometimes with a coma.


Distribution and occurrence: World: c. 22 genera, 640 species, warmer regions especially North America. Australia: 5 genera, 38 species, all States.

External links:
Angiosperm Phylogeny Website (Family: Onagraceae, Order: Myrtales)
Wikipedia

A number of species of Clarkia, Fuchsia and Oenothera are widely cultivated as garden plants, many of which tend to escape and become minor weeds.

Text by J. M. Dalby
Taxon concept:

Taxa not yet included in identification key
Fuchsia

 Key to the genera 
1Sepals persistent on fruitLudwigia
Sepals shed after anthesis2
2Fruit indehiscent and few-seededGaura
Fruit dehiscent, usually many-seeded
                       Back to 1
3
3Hypanthium conspicuous; seeds not comoseOenothera
Hypanthium short or absent; seeds usually comose
                       Back to 2
Epilobium

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