Genera: A B C D E F G H I J K L M N O P Q-R S T U V W X-Y-Z
Families: A B C D E F G H I J L M N O P R S T U V W-X-Z
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Families - O
Oleaceae
Onagraceae
Onocleaceae
Ophioglossaceae
Orchidaceae
Orobanchaceae
Osmundaceae
Oxalidaceae
OLEACEAE (Olive Family)
ChionanthusForsythia
Fraxinus
Ligustrum
Syringa
ONAGRACEAE (Evening-primrose Family)
Calylophus (see Oenothera)Camissonia
Camissoniopsis
Chamaenerion
Chamerion (see Chamaenerion)
Circaea
Clarkia
Epilobium (see also Chamaenerion)
Gaura (see Oenothera)
Ludwigia
Oenothera
ONOCLEACEAE (Sensitive Fern Family)
MatteucciaOnoclea
Pteretis (See Matteuccia)
OPHIOGLOSSACEAE (Adder's-tongue Family)
BotrychiumOphioglossum
ORCHIDACEAE (Orchid Family)
AmerorchisAplectrum
Arethusa
Calopogon
Calypso
Coeloglossum (see Dactylorhiza)
Corallorhiza
Cypripedium
Dactylorhiza
Epipactis
Galearis
Goodyera
Habenaria (see Dactylorhiza & Platanthera)
Isotria
Liparis
Listera (see Neottia)
Malaxis
Neottia
Orchis (see Amerorchis & Galearis)
Platanthera
Pogonia
Spiranthes
Tipularia
Triphora
OROBANCHACEAE (Broomrape Family)
AgalinisAureolaria
Castilleja
Conopholis
Epifagus
Euphrasia
Gerardia (see Agalinis & Aureolaria)
Melampyrum
Odontites
Orobanche
Pedicularis
Rhinanthus
Schwalbea
OSMUNDACEAE (Royal Fern Family)
Osmunda (see also Osmundastrum)Osmundastrum
OXALIDACEAE (Wood Sorrel Family)
OxalisXanthoxalis (see Oxalis)
Designed by Ray Angelo. Revised Jan. 18, 2017