| Preview pict. | Species, Subspecies, Variety, Forma | Section | |
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Odontorchis (4 Syn.)
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| Tridentatae | | |
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Ophrys / Bee Orchid (348 Taxa + 72 Syn.) |
| Umbilicatae | | |
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Orchis / Orchid (40 Taxa + 52 Syn.) |
| Militares | | |
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oaseana, Epipactis veratrifolia subsp. / Scarce Marsh Helleborine |
| Veratrifoliae | | IL
Zyp
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obaesa, Ophrys / Led-Colored Bee Orchid |
| Fusci | | Siz
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oblita, Ophrys / Forgotten Bee Orchid |
| Fuciflorae | | IL
TR
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obtusata subsp. oligantha, Platanthera −−> Platanthera oligantha
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| - | | S
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occidentalis (3 Syn.)
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occitanica, Dactylorhiza / - |
| Latifoliae | | F
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ochroleuca (1 Taxon + 1 Syn.) |
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odoratissima deformation, Gymnadenia / Short-spurred Fragrant Orchid |
| - | | A
D
I
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odoratissima subsp. longicalcarata, Gymnadenia −−> Gymnadenia conopsea subsp. pyrenaica
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| - | | E
F
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odoratissima, Gymnadenia / Short-spurred Fragrant Orchid |
| - | | A
D
I
SLO
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oestrifera s.l., Ophrys / Horsefly |
| Umbilicatae | | Rho
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oestrifera subsp. akcaliensis, Ophrys / Akcali Orchid |
| Umbilicatae | | TR
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oestrifera subsp. minutiflora, Ophrys / Pamphylia Orchid |
| Umbilicatae | | TR
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oestrifera subsp. montis-gargani, Ophrys / Gargano Orchid |
| Umbilicatae | | I
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oestrifera, Ophrys / Horsefly |
| Umbilicatae | | RO
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okellyi (1 Taxon + 1 Syn.) |
| | | |
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olbia, Serapias / Hybrid Serapias |
| - | | F
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olbiensis farbvariante_color-variant, Orchis / Hyères Orchid |
| Masculae | | E
F
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olbiensis (1 Taxon + 2 Syn.) |
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oligantha (1 Taxon + 2 Syn.) |
| | | |
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oligantha, Lysiella −−> Platanthera oligantha
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| - | | S
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oligantha, Platanthera / Blunt-Leaved Orchid, Small Northern Bog Orchid |
| - | | S
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oligantha, Platanthera obtusata subsp. −−> Platanthera oligantha
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| - | | S
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olonae, Ophrys suboccidentalis subsp. / Olonne Spider Orchid |
| Araneiferae | | F
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omegaifera, Ophrys / Omega Bee Orchid |
| Fusci (Omegaiferae) | | Chi
Kre
Rho
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oreas, Ophrys / Oreades Orchid |
| Fuciflorae | | Rho
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orientalis subsp. carica, Serapias / Carian Serapias |
| - | | Rho
Sam
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orientalis subsp. cycladum, Serapias / Cyclades Serapias |
| - | | Sam
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orientalis subsp. levantina, Serapias −−> Serapias levantina
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| - | | IL
Zyp
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orientalis subsp. siciliensis, Serapias / Sicilian Serapias |
| - | | Siz
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orientalis (3 Taxa) |
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orphanidea, Ophrys / Orphanides' Bee Orchid |
| Umbilicatae | | Chi
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osca, Platanthera bifolia subsp. / Osca Butterfly Orchid |
| - | | I
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osiliensis, Dactylorhiza / Saaremaa Orchid |
| Latifoliae | | Est
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osmaniaca, Ophrys herae subsp. / Turkish Hera Orchid |
| Mammosae | | TR
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osmanica subsp. anatolica, Dactylorhiza / Anatolian Orchid |
| Incarnatae | | TR
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ovalis (2 Syn.)
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ovata (2 Taxa + 1 Syn.) |
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oxyrrhynchos subsp. celiensis, Ophrys / Apulian Beak Bee Orchid |
| Fuciflorae | | I
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oxyrrhynchos, Ophrys / Beak Bee Orchid |
| Fuciflorae | | Siz
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