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Below is a list of plant families, and a list of genera within each family in California.
Click on family name to search for species in that family, or click on genus name to search for species in that genus. | ||||
| Oleaceae |
Forestiera Fraxinus Jasminum |
Ligustrum Menodora Olea |
Syringa |
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| Onagraceae |
Camissonia Camissoniopsis Chamerion Chylismia Chylismiella Circaea |
Clarkia Epilobium Eremothera Eulobus Fuchsia Gayophytum |
Ludwigia Neoholmgrenia Oenothera Taraxia Tetrapteron |
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| Ophioglossaceae |
Botrychium Botrypus |
Ophioglossum Sceptridium |
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| Orchidaceae |
Calypso Cephalanthera Corallorhiza Cypripedium |
Epipactis Goodyera Listera Malaxis |
Piperia Platanthera Spiranthes Zeuxine |
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| Orobanchaceae |
Aphyllon Bellardia Castilleja Chloropyron Cordylanthus |
Dicranostegia Kopsiopsis Orobanche Orthocarpus Parentucellia |
Pedicularis Phelipanche Triphysaria |
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| Orthodontiaceae | Orthodontium | |||
| Orthotrichaceae |
Codonoblepharon Lewinskya Nyholmiella |
Orthotrichum Pulvigera Ulota |
Zygodon |
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| Oxalidaceae | Oxalis | |||