| Vorschaubild | Art, Unterart oder Varietät | Familie |  | Fotos von | 
| Preview pict. | Species, Subspecies, or Variety | Family |  | Photos from | 
|  | Oak Fern | Gymnocarpium dryopteris | Pteridopsida \ Echte Farne / True Ferns |  | A 
F 
S | 
| Oak Moss | Evernia prunastri | Lecanorales \ Flechten / Lichens |  | D | 
| Oak, Alder-Leaved | Quercus alnifolia | Fagaceae \ Buchengew. / Beech Fam. |  | Zyp | 
| Oak, Aleppo | Quercus infectoria | Fagaceae \ Buchengew. / Beech Fam. |  | Sam | 
| Oak, Aucher's | Quercus aucherii | Fagaceae \ Buchengew. / Beech Fam. |  | Rho | 
| Oak, Boissier's Dyer's | Quercus infectoria subsp. veneris | Fagaceae \ Buchengew. / Beech Fam. |  | Zyp | 
| Oak, Common | Quercus robur | Fagaceae \ Buchengew. / Beech Fam. |  | D 
S | 
| Oak, Cork | Quercus suber | Fagaceae \ Buchengew. / Beech Fam. |  | Cor 
D 
F | 
|  | Oak, Dalechamp's | Quercus dalechampii | Fagaceae \ Buchengew. / Beech Fam. |  | I | 
| Oak, Evergreen | Quercus ilex | Fagaceae \ Buchengew. / Beech Fam. |  | E 
F 
HR 
I 
Kef 
Mal | 
| Oak, Hungarian | Quercus frainetto | Fagaceae \ Buchengew. / Beech Fam. |  | Chi 
D 
GR | 
| Oak, Italian | Quercus frainetto | Fagaceae \ Buchengew. / Beech Fam. |  | Chi 
D 
GR | 
| Oak, Jerusalem | Dysphania botrys | Chenopodiaceae \ Gänsefußgew. / Goosefoot Fam. |  | D | 
| Oak, Kermes | Quercus coccifera | Fagaceae \ Buchengew. / Beech Fam. |  | Chi 
F 
GR 
Kre 
Rho 
Sam 
Zyp | 
| Oak, Macedonian | Quercus trojana | Fagaceae \ Buchengew. / Beech Fam. |  | Chi 
GR | 
| Oak, Mount Tabor | Quercus ithaburensis subsp. ithaburensis | Fagaceae \ Buchengew. / Beech Fam. |  | Zyp | 
|  | Oak, Northern Red | Quercus rubra | Fagaceae \ Buchengew. / Beech Fam. |  | D | 
| Oak, Pin | Quercus palustris | Fagaceae \ Buchengew. / Beech Fam. |  | D | 
| Oak, Portuguese | Quercus faginea | Fagaceae \ Buchengew. / Beech Fam. |  | E | 
| Oak, Pyramidal | Quercus robur forma fastigiata | Fagaceae \ Buchengew. / Beech Fam. |  | D | 
| Oak, Pyrenean | Quercus pyrenaica | Fagaceae \ Buchengew. / Beech Fam. |  | E | 
| Oak, Scarlet | Quercus coccinea | Fagaceae \ Buchengew. / Beech Fam. |  | D | 
| Oak, Sessile | Quercus petraea | Fagaceae \ Buchengew. / Beech Fam. |  | D 
HR | 
| Oak, Turkey | Quercus cerris | Fagaceae \ Buchengew. / Beech Fam. |  | A 
D 
GR 
HR | 
|  | Oak, Turner's | Quercus x turneri | Fagaceae \ Buchengew. / Beech Fam. |  | D | 
| Oak, Valonian | Quercus ithaburensis subsp. macrolepis | Fagaceae \ Buchengew. / Beech Fam. |  | GR 
Kre 
Les 
Rho | 
| Oak, White | Quercus pubescens | Fagaceae \ Buchengew. / Beech Fam. |  | D 
E 
F 
GR 
HR 
I 
Kre 
Les 
S | 
| Oak-Leaved Goosefoot | Chenopodium glaucum | Chenopodiaceae \ Gänsefußgew. / Goosefoot Fam. |  | A 
D 
NL 
S | 
| Oak-Leaved Lettuce | Lactuca quercina | Asteraceae \ Korbblütler / Composite Fam. |  | D | 
| Oakleaf, Mexican | Shinnersia rivularis | Asteraceae \ Korbblütler / Composite Fam. |  | A | 
| Oat Grass, Alpine | Helictotrichon praeustum | Poaceae \ Süßgräser / Grass Fam. |  | A | 
| Oat Grass, Bulbous | Arrhenatherum elatius | Poaceae \ Süßgräser / Grass Fam. |  | D | 
|  | Oat Grass, Downy Alpine | Helictotrichon pubescens | Poaceae \ Süßgräser / Grass Fam. |  | D | 
| Oat Grass, Golden | Trisetaria aurea | Poaceae \ Süßgräser / Grass Fam. |  | Kef | 
| Oat Grass, Parlatore's | Helictotrichon parlatorei | Poaceae \ Süßgräser / Grass Fam. |  | I | 
| Oat Grass, Seyne | Helictotrichon sedenense | Poaceae \ Süßgräser / Grass Fam. |  | F | 
| Oat Grass, Smooth | Helictotrichon pubescens subsp. laevigatum | Poaceae \ Süßgräser / Grass Fam. |  | A | 
| Oat Grass, Spiked | Trisetum spicatum | Poaceae \ Süßgräser / Grass Fam. |  | A | 
| Oat Grass, Tall | Arrhenatherum elatius | Poaceae \ Süßgräser / Grass Fam. |  | D | 
| Oat Grass, Yellow | Trisetum flavescens | Poaceae \ Süßgräser / Grass Fam. |  | D | 
|  | Oat Grass | Helictotrichon versicolor | Poaceae \ Süßgräser / Grass Fam. |  | A | 
| Oat, Animated | Avena sterilis | Poaceae \ Süßgräser / Grass Fam. |  | GR 
Rho 
Zyp | 
| Oat, Common Wild | Avena fatua | Poaceae \ Süßgräser / Grass Fam. |  | D | 
| Oat, Common | Avena sativa | Poaceae \ Süßgräser / Grass Fam. |  | D | 
| Oat, Short-Haired | Avena hybrida | Poaceae \ Süßgräser / Grass Fam. |  | D | 
| Oat, Slender Wild | Avena barbata | Poaceae \ Süßgräser / Grass Fam. |  | D | 
| Oat, Wild | Bromus ramosus | Poaceae \ Süßgräser / Grass Fam. |  | D 
DK | 
| Oat, Winter Wild | Avena sterilis | Poaceae \ Süßgräser / Grass Fam. |  | GR 
Rho 
Zyp | 
|  | Oberwald Goldilocks | Ranunculus suprasilvaticus | Ranunculaceae \ Hahnenfußgew. / Buttercup Fam. |  | F | 
| Oblong Leaved Orache | Atriplex oblongifolia | Chenopodiaceae \ Gänsefußgew. / Goosefoot Fam. |  | D | 
| Oblong Woodsia | Woodsia ilvensis | Pteridopsida \ Echte Farne / True Ferns |  | D | 
| Oblong-Leaved Dandelion | Taraxacum oblongatum 
 ? | Asteraceae \ Korbblütler / Composite Fam. |  | D | 
| Oblong-Leaved Sundew | Drosera intermedia | Droseraceae \ Sonnentaugewächse / Sundew Fam. |  | D 
F | 
| Obtuse Couch | Elymus obtusiflorus | Poaceae \ Süßgräser / Grass Fam. |  | D | 
| Obtuse-Angle Bramble | Rubus obtusangulus | Rosaceae \ Rosengewächse / Rose Fam. |  | D | 
| Obtuse-Lobed Corn Salad | Valerianella obtusiloba | Valerianaceae \ Baldriangew. / Valerian Fam. |  | Kre 
Mal | 
|  | Odorant Treacle Mustard | Erysimum odoratum | Brassicaceae \ Kreuzblütler / Crucifers |  | A 
D 
HR | 
| Odorous Pig Salad | Aposeris foetida | Asteraceae \ Korbblütler / Composite Fam. |  | A 
D 
HR | 
| Oeder's Lousewort | Pedicularis oederi | Scrophulariaceae \ Braunwurzgew. / Figwort Fam. |  | A | 
| Oehlkers' Evening Primrose | Oenothera oehlkersii | Onagraceae \ Nachtkerzengew. / Willowherb Fam. |  | D | 
| Oellgaard's Clubmoss | Diphasiastrum oellgaardii | Lycopodiaceae \ Bärlappgew. / Clubmoss Fam. |  | D | 
| Oil Radish | Raphanus sativus var. oleiformis | Brassicaceae \ Kreuzblütler / Crucifers |  | D | 
| Oil-Plant, Castor | Ricinus communis | Euphorbiaceae \ Wolfsmilchgew. / Spurge Fam. |  | GR 
Kre 
Rho 
Ten | 
| Oilseed Rape | Brassica napus | Brassicaceae \ Kreuzblütler / Crucifers |  | D | 
|  | Okra | Abelmoschus esculentus | Malvaceae \ Malvengewächse / Mallow Fam. |  | GR | 
| Oland Bedstraw | Galium oelandicum | Rubiaceae \ Rötegewächse / Bedstraw Fam. |  | S | 
| Oland Rock-Rose | Helianthemum oelandicum | Cistaceae \ Zistrosengew. / Rockrose Fam. |  | GR 
S | 
| Oleander | Nerium oleander | Apocynaceae \ Hundsgiftgew. / Periwinkle Fam. |  | D 
GR 
Kre 
Les 
Rho 
Zyp | 
| Oleaster, Bastard | Elaeagnus latifolia | Elaeagnaceae \ Ölweidengew. / Sea-Buckthorn Fam. |  | D | 
| Oleaster, Narrow-Leaved | Elaeagnus angustifolia | Elaeagnaceae \ Ölweidengew. / Sea-Buckthorn Fam. |  | A 
D 
F | 
| Oleaster | Olea sylvestris | Oleaceae \ Ölbaumgewächse / Ash Fam. |  | F 
GR 
Rho 
Zyp | 
| Olive Willow | Salix elaeagnos | Salicaceae \ Weidengewächse / Willow Fam. |  | A 
D 
E 
GR | 
|  | Olive, Australian | Olea paniculata | Oleaceae \ Ölbaumgewächse / Ash Fam. |  | GR | 
| Olive, Native | Olea paniculata | Oleaceae \ Ölbaumgewächse / Ash Fam. |  | GR | 
| Olive, Russian | Elaeagnus angustifolia | Elaeagnaceae \ Ölweidengew. / Sea-Buckthorn Fam. |  | A 
D 
F | 
| Olive, Spurge | Cneorum tricoccon | Cneoraceae \ Zwergölbaumgew. / Spurge Olive Fam. |  | F 
GR 
Mal | 
| Olive, Spurge | Daphne oleoides | Thymelaeaceae \ Seidelbastgew. / Daphne Fam. |  | Cor 
GR | 
| Olive | Olea europaea var. europaea | Oleaceae \ Ölbaumgewächse / Ash Fam. |  | Chi 
Cor 
F 
GR 
I 
Kef 
Kre 
Mal 
Rho 
Sam 
Zyp | 
| Olivier's Crocus | Crocus olivieri subsp. olivieri | Iridaceae \ Irisgewächse / Iris Fam. |  | Chi | 
| Olymp Sage, Mount | Salvia ringens | Lamiaceae \ Lippenblütler / Mint Fam. |  | GR | 
|  | Olymp St. John's-Wort, Mount | Hypericum olympicum | Hypericaceae \ Johanniskrautgew. / St.John's Wort Fam. |  | Cor 
D 
F | 
| Omphalina | Botrydina botrydioides 
 ? | Lecanorales \ Flechten / Lichens |  | D | 
| One-Flowered Clover | Trifolium uniflorum | Fabaceae \ Schmetterlingsblütler / Legumes |  | Chi 
GR 
Kre 
Les 
Rho 
Sam | 
| One-Flowered Horseshoe Vetch | Hippocrepis unisiliquosa | Fabaceae \ Schmetterlingsblütler / Legumes |  | Chi 
D 
Rho | 
| One-Fruited Plantain | Plantago monosperma | Plantaginaceae \ Wegerichgew. / Plantain Fam. |  | F | 
| One-Headed Cat's-Ear | Trommsdorffia uniflora | Asteraceae \ Korbblütler / Composite Fam. |  | A 
D 
I | 
| One-Leaved Nut Iris | Moraea mediterranea | Iridaceae \ Irisgewächse / Iris Fam. |  | Kre | 
| One-Leaved Squill | Scilla monophyllos | Liliaceae \ Liliengewächse / Lily Fam. |  | P | 
|  | One-Row Water Cress | Nasturtium microphyllum | Brassicaceae \ Kreuzblütler / Crucifers |  | D | 
| One-flowered Wintergreen | Moneses uniflora | Pyrolaceae \ Wintergrüngew. / Wintergreen Fam. |  | A 
F 
I | 
| Oneflower Fleabane | Erigeron uniflorus | Asteraceae \ Korbblütler / Composite Fam. |  | A 
F | 
| Onion, Angle | Allium angulosum | Liliaceae \ Liliengewächse / Lily Fam. |  | A 
D | 
| Onion, Persian | Allium cristophii | Liliaceae \ Liliengewächse / Lily Fam. |  | D | 
| Onion, Purple Flowering | Allium atropurpureum | Liliaceae \ Liliengewächse / Lily Fam. |  | D | 
| Onion, Wild | Allium vineale | Liliaceae \ Liliengewächse / Lily Fam. |  | D | 
| Onion | Allium cepa | Liliaceae \ Liliengewächse / Lily Fam. |  | D | 
|  | Onosma-Leaved Hawkweed | Hieracium onosmoides subsp. buglossoides | Asteraceae \ Korbblütler / Composite Fam. |  | D | 
| Onsdorf Goldilocks | Ranunculus onsdorfensis | Ranunculaceae \ Hahnenfußgew. / Buttercup Fam. |  | D | 
| Opium Poppy | Papaver somniferum | Papaveraceae \ Mohngewächse / Poppy Fam. |  | D 
F 
Mal | 
| Opposite-Leaved Golden-Saxifrage | Chrysosplenium oppositifolium | Saxifragaceae \ Steinbrechgew. / Saxifrage Fam. |  | D 
F | 
| Opposite-Leaved Pontweed | Groenlandia densa | Potamogetonaceae \ Laichkrautgew. / Pontweed Fam. |  | D | 
| Oppositeleaf Glasswort | Salsola soda | Chenopodiaceae \ Gänsefußgew. / Goosefoot Fam. |  | GR | 
| Orache, Babington's | Atriplex glabriuscula | Chenopodiaceae \ Gänsefußgew. / Goosefoot Fam. |  | D 
NL | 
| Orache, Common | Atriplex patula | Chenopodiaceae \ Gänsefußgew. / Goosefoot Fam. |  | D | 
|  | Orache, Frosted | Atriplex laciniata | Chenopodiaceae \ Gänsefußgew. / Goosefoot Fam. |  | IRL | 
| Orache, Garden | Atriplex hortensis | Chenopodiaceae \ Gänsefußgew. / Goosefoot Fam. |  | D | 
| Orache, Glossy-Leaved | Atriplex sagittata | Chenopodiaceae \ Gänsefußgew. / Goosefoot Fam. |  | D | 
| Orache, Grassleaf | Atriplex littoralis | Chenopodiaceae \ Gänsefußgew. / Goosefoot Fam. |  | A 
D 
DK 
NL 
S | 
| Orache, Hastate | Atriplex calotheca | Chenopodiaceae \ Gänsefußgew. / Goosefoot Fam. |  | S | 
| Orache, Hybrid | Atriplex x northusana | Chenopodiaceae \ Gänsefußgew. / Goosefoot Fam. |  | D | 
| Orache, Long-Stalked | Atriplex longipes | Chenopodiaceae \ Gänsefußgew. / Goosefoot Fam. |  | D | 
| Orache, Oblong Leaved | Atriplex oblongifolia | Chenopodiaceae \ Gänsefußgew. / Goosefoot Fam. |  | D | 
|  | Orache, Sea | Atriplex halimus | Chenopodiaceae \ Gänsefußgew. / Goosefoot Fam. |  | F 
GR 
Zyp | 
| Orache, Spear-Leaved | Atriplex prostrata 
 ? | Chenopodiaceae \ Gänsefußgew. / Goosefoot Fam. |  | Cor 
D 
DK 
F 
GR 
NL 
S | 
| Orache, Spreading | Atriplex patula | Chenopodiaceae \ Gänsefußgew. / Goosefoot Fam. |  | D | 
| Orache, Tatarian | Atriplex tatarica | Chenopodiaceae \ Gänsefußgew. / Goosefoot Fam. |  | A | 
| Orache, Thorn | Bassia hyssopifolia | Chenopodiaceae \ Gänsefußgew. / Goosefoot Fam. |  | S | 
| Orache, Tumbling | Atriplex rosea | Chenopodiaceae \ Gänsefußgew. / Goosefoot Fam. |  | D 
S | 
| Orache, Two-Seeded | Atriplex micrantha | Chenopodiaceae \ Gänsefußgew. / Goosefoot Fam. |  | D | 
| Orange Avens, Dwarf | Geum coccineum | Rosaceae \ Rosengewächse / Rose Fam. |  | F | 
|  | Orange Foxtail | Alopecurus aequalis | Poaceae \ Süßgräser / Grass Fam. |  | D 
F 
I | 
| Orange Groundsel | Tephroseris capitata | Asteraceae \ Korbblütler / Composite Fam. |  | A 
F | 
| Orange Hawkweed | Hieracium aurantiacum | Asteraceae \ Korbblütler / Composite Fam. |  | A 
D 
F | 
| Orange Jewelweed | Impatiens capensis | Balsaminaceae \ Springkrautgew. / Balsam Fam. |  | D | 
| Orange Lily | Lilium bulbiferum subsp. bulbiferum | Liliaceae \ Liliengewächse / Lily Fam. |  | A 
HR 
I | 
| Orange Lily | Lilium bulbiferum subsp. croceum | Liliaceae \ Liliengewächse / Lily Fam. |  | A 
I | 
| Orange Mullein | Verbascum phlomoides | Scrophulariaceae \ Braunwurzgew. / Figwort Fam. |  | A 
D 
HR | 
| Orange Tree | Citrus x sinensis | Rutaceae \ Rautengewächse / Rue Fam. |  | Chi | 
|  | Orange Vetchling | Lathyrus gorgoni | Fabaceae \ Schmetterlingsblütler / Legumes |  | Chi 
Rho 
Sam | 
| Orange, Bitter | Citrus x aurantium | Rutaceae \ Rautengewächse / Rue Fam. |  | GR | 
| Orange, Japanese Bitter | Citrus trifoliata | Rutaceae \ Rautengewächse / Rue Fam. |  | D | 
| Orange, Seville | Citrus x aurantium | Rutaceae \ Rautengewächse / Rue Fam. |  | GR | 
| Orange, Sweet Mock | Philadelphus coronarius | Hydrangeaceae \ Hortensiengew. / Hydrangea Fam. |  | D | 
| Orange, Trifoliate | Citrus trifoliata | Rutaceae \ Rautengewächse / Rue Fam. |  | D | 
| Orchard Grass | Dactylis glomerata | Poaceae \ Süßgräser / Grass Fam. |  | D 
GR 
Sam | 
| Oregano, Cascading Sweet | Origanum libanoticum | Lamiaceae \ Lippenblütler / Mint Fam. |  | D | 
|  | Oregano, Cretan | Origanum onites | Lamiaceae \ Lippenblütler / Mint Fam. |  | Chi 
GR 
Rho | 
| Oregano, Greek | Origanum vulgare subsp. hirtum | Lamiaceae \ Lippenblütler / Mint Fam. |  | GR | 
| Oregano, Greenish | Origanum vulgare subsp. viridulum | Lamiaceae \ Lippenblütler / Mint Fam. |  | GR | 
| Oregano, Hopflower | Origanum libanoticum | Lamiaceae \ Lippenblütler / Mint Fam. |  | D | 
| Oregano, Oregano,Knotted Marjoram, | Origanum majorana | Lamiaceae \ Lippenblütler / Mint Fam. |  | D 
GR 
S 
Zyp | 
| Oregano, Oregano,Roundleaf | Origanum rotundifolium | Lamiaceae \ Lippenblütler / Mint Fam. |  | D | 
| Oregano, Spanish | Origanum vulgare subsp. virens | Lamiaceae \ Lippenblütler / Mint Fam. |  | E | 
| Oregano, Syrian | Origanum syriacum | Lamiaceae \ Lippenblütler / Mint Fam. |  | D | 
|  | Oregano, Turkish | Origanum onites | Lamiaceae \ Lippenblütler / Mint Fam. |  | Chi 
GR 
Rho | 
| Oregano,Knotted Marjoram,Oregano | Origanum majorana | Lamiaceae \ Lippenblütler / Mint Fam. |  | D 
GR 
S 
Zyp | 
| Oregano,Roundleaf Oregano | Origanum rotundifolium | Lamiaceae \ Lippenblütler / Mint Fam. |  | D | 
| Oregano | Origanum vulgare | Lamiaceae \ Lippenblütler / Mint Fam. |  | A 
D 
F 
HR 
SLO | 
| Oregon Grape, Beale's | Mahonia bealei | Berberidaceae \ Sauerdorngew. / Barberry Fam. |  | D | 
| Oregon Grape, Leatherleaf | Mahonia bealei | Berberidaceae \ Sauerdorngew. / Barberry Fam. |  | D | 
| Oregon Grape, Shining | Mahonia aquifolium | Berberidaceae \ Sauerdorngew. / Barberry Fam. |  | D | 
| Oregon Grape, Tall | Mahonia aquifolium | Berberidaceae \ Sauerdorngew. / Barberry Fam. |  | D | 
|  | Oregon Grape, Wagner's | Mahonia x wagneri | Berberidaceae \ Sauerdorngew. / Barberry Fam. |  | D | 
| Oregon Grape | Mahonia x decumbens | Berberidaceae \ Sauerdorngew. / Barberry Fam. |  | A | 
| Oreochloa | Oreochloa disticha | Poaceae \ Süßgräser / Grass Fam. |  | A 
E 
I | 
| Orford Cedar, Port | Chamaecyparis lawsoniana | Cupressaceae \ Zypressengew. / Cypresse Fam. |  | D | 
| Oriental Alder | Alnus orientalis | Betulaceae \ Birkengew. / Birch Fam. |  | Zyp | 
| Oriental Alkanet | Alkanna orientalis | Boraginaceae \ Borretschgew. / Borrage Fam. |  | D | 
| Oriental Arbor-Vitae | Platycladus orientalis | Cupressaceae \ Zypressengew. / Cypresse Fam. |  | D 
I | 
| Oriental Borage | Trachystemon orientalis | Boraginaceae \ Borretschgew. / Borrage Fam. |  | D | 
|  | Oriental Hawthorn | Crataegus orientalis | Rosaceae \ Rosengewächse / Rose Fam. |  | Les | 
| Oriental Hellebore | Helleborus orientalis | Ranunculaceae \ Hahnenfußgew. / Buttercup Fam. |  | D | 
| Oriental Knapweed | Centaurea orientalis | Asteraceae \ Korbblütler / Composite Fam. |  | D | 
| Oriental Knautia | Knautia orientalis | Dipsacaceae \ Kardengewächse / Teasel Fam. |  | S | 
| Oriental Knotweed | Persicaria orientalis | Polygonaceae \ Knöterichgew. / Knotweed Fam. |  | D | 
| Oriental Milk-Vetch | Astragalus lusitanicus subsp. orientalis | Fabaceae \ Schmetterlingsblütler / Legumes |  | GR 
Zyp | 
| Oriental Plane-Tree | Platanus orientalis | Platanaceae \ Platanengew. / Plane Tree Fam. |  | GR 
I 
Kre 
Les 
Rho 
Sam 
Zyp | 
| Oriental Poppy, False | Papaver setiferum | Papaveraceae \ Mohngewächse / Poppy Fam. |  | D | 
|  | Oriental Smartweed | Persicaria orientalis | Polygonaceae \ Knöterichgew. / Knotweed Fam. |  | D | 
| Oriental Strawflower | Helichrysum orientale | Asteraceae \ Korbblütler / Composite Fam. |  | Sam | 
| Orlaya, Carrot | Orlaya daucorlaya | Apiaceae \ Doldenblütler / Umbellifers |  | GR | 
| Orlaya, False | Daucus pumilus | Apiaceae \ Doldenblütler / Umbellifers |  | E 
Les 
Mal 
Rho | 
| Orlaya, Flat-Fruited | Orlaya daucoides | Apiaceae \ Doldenblütler / Umbellifers |  | Chi 
F 
Rho 
Zyp | 
| Orlaya, Large-Flowered | Orlaya grandiflora | Apiaceae \ Doldenblütler / Umbellifers |  | A 
D 
F 
HR 
I | 
| Ornamental Knapweed | Centaurea nervosa | Asteraceae \ Korbblütler / Composite Fam. |  | HR 
I 
SLO | 
| Orphanides Tulip | Tulipa orphanidea | Liliaceae \ Liliengewächse / Lily Fam. |  | GR | 
|  | Orsini's Speedwell | Veronica orsiniana | Scrophulariaceae \ Braunwurzgew. / Figwort Fam. |  | D 
I | 
| Osier Dogwood, Red | Cornus sericea | Cornaceae \ Hartriegelgew. / Dogwood Fam. |  | D | 
| Osier, Common | Salix viminalis | Salicaceae \ Weidengewächse / Willow Fam. |  | D 
F 
NL | 
| Osterbotten Sedge | Carex halophila | Cyperaceae \ Sauergräser / Sedge Fam. |  | S | 
| Ostrich Fern | Matteuccia struthiopteris | Pteridopsida \ Echte Farne / True Ferns |  | A 
D | 
| Ottoman Comfrey | Symphytum ottomanum | Boraginaceae \ Borretschgew. / Borrage Fam. |  | GR | 
| Oval Purse | Hornungia procumbens | Brassicaceae \ Kreuzblütler / Crucifers |  | D | 
| Oval Sedge | Carex ovalis | Cyperaceae \ Sauergräser / Sedge Fam. |  | A 
D 
F | 
|  | Oval-Leaved Privet | Ligustrum ovalifolium | Oleaceae \ Ölbaumgewächse / Ash Fam. |  | IRL | 
| Ovate Spike Rush | Eleocharis obtusa | Cyperaceae \ Sauergräser / Sedge Fam. |  | D | 
| Ovate Spike Rush | Eleocharis ovata | Cyperaceae \ Sauergräser / Sedge Fam. |  | D 
F | 
| Overlapping Goldilocks | Ranunculus contegens | Ranunculaceae \ Hahnenfußgew. / Buttercup Fam. |  | F | 
| Overleaf Pellia | Pellia epiphylla | Marchantiales \ Lebermoose / Liverworts |  | D | 
| Overlong Bramble | Rubus perlongus | Rosaceae \ Rosengewächse / Rose Fam. |  | D | 
| Oviedo Bellflower | Campanula arvatica subsp. arvatica | Campanulaceae \ Glockenblumengew. / Bellflower Fam. |  | E | 
| Ox-Eye Daisy, Cantabrian | Leucanthemum gaudinii subsp. cantabricum | Asteraceae \ Korbblütler / Composite Fam. |  | E | 
|  | Ox-Eye Daisy, Common | Leucanthemum ircutianum | Asteraceae \ Korbblütler / Composite Fam. |  | D | 
| Ox-Eye Daisy, Coronopus-Leaved | Leucanthemum atratum subsp. coronopifolium | Asteraceae \ Korbblütler / Composite Fam. |  | F | 
| Ox-Eye Daisy, Early | Leucanthemum vulgare | Asteraceae \ Korbblütler / Composite Fam. |  | A 
D 
E 
F 
I 
IRL | 
| Ox-Eye Daisy, Eastern Mountain | Leucanthemum adustum subsp. margaritae | Asteraceae \ Korbblütler / Composite Fam. |  | A 
HR | 
| Ox-Eye Daisy, Grassleaf | Leucanthemum graminifolium | Asteraceae \ Korbblütler / Composite Fam. |  | F | 
| Ox-Eye Daisy, Haller's | Leucanthemum atratum subsp. halleri | Asteraceae \ Korbblütler / Composite Fam. |  | A | 
| Ox-Eye Daisy, Shasta | Leucanthemum maximum | Asteraceae \ Korbblütler / Composite Fam. |  | And 
D 
F | 
| Ox-Eye Daisy, Variousleaf | Leucanthemum heterophyllum | Asteraceae \ Korbblütler / Composite Fam. |  | A 
HR 
I | 
|  | Ox-Eye Daisy, Western Mountain | Leucanthemum adustum subsp. adustum | Asteraceae \ Korbblütler / Composite Fam. |  | D 
F 
I | 
| Ox-Eye Daisy | Leucanthemum atratum subsp. atratum | Asteraceae \ Korbblütler / Composite Fam. |  | A | 
| Ox-Eye, Yellow | Buphthalmum salicifolium | Asteraceae \ Korbblütler / Composite Fam. |  | A 
D 
F 
HR 
I | 
| Ox-Tongue, Bristly | Picris echioides | Asteraceae \ Korbblütler / Composite Fam. |  | D 
E 
F 
HR 
I 
NL | 
| Ox-Tongue, Hawkweed | Picris hieracioides | Asteraceae \ Korbblütler / Composite Fam. |  | A 
CH 
D 
E 
F 
HR 
I | 
| Ox-Tongue, Spiny | Picris hieracioides subsp. spinulosa | Asteraceae \ Korbblütler / Composite Fam. |  | HR | 
| Ox-Tongue, Umbellate | Picris hieracioides subsp. umbellata | Asteraceae \ Korbblütler / Composite Fam. |  | E | 
| Ox-lip | Primula elatior | Primulaceae \ Primelgewächse / Primrose Fam. |  | A 
D 
E 
F 
I | 
|  | Oxalis, Upright | Oxalis stricta | Oxalidaceae \ Sauerkleegew. / Wood-Sorrel Fam. |  | D | 
| Oxelmann's Corydalis | Corydalis blanda subsp. oxelmannii | Fumariaceae \ Erdrauchgew. / Fumitory Fam. |  | GR | 
| Oxeye, Dwarf | Telekia speciosissima | Asteraceae \ Korbblütler / Composite Fam. |  | D | 
| Oxeye, Sweet-Scented | Asteriscus aquaticus | Asteraceae \ Korbblütler / Composite Fam. |  | Mal 
Zyp | 
| Oxeye, Yellow | Telekia speciosa | Asteraceae \ Korbblütler / Composite Fam. |  | A 
D 
HR | 
| Oxford Crane's-Bill, Thurston’s | Geranium x oxonianum forma thurstonianum | Geraniaceae \ Storchschnabelgew. / Crane's-Bill Fam. |  | IRL | 
| Oxford Crane's-Bill | Geranium x oxonianum | Geraniaceae \ Storchschnabelgew. / Crane's-Bill Fam. |  | D | 
| Oxford Rampion | Phyteuma scheuchzeri subsp. scheuchzeri | Campanulaceae \ Glockenblumengew. / Bellflower Fam. |  | I | 
|  | Oxtongue Broomrape | Orobanche picridis | Orobanchaceae \ Sommerwurzgew. / Broomrape Fam. |  | Cor 
D 
F 
GR 
HR 
Les 
Sar | 
| Oxytropis, Haller's | Oxytropis halleri | Fabaceae \ Schmetterlingsblütler / Legumes |  | A 
F | 
| Oxytropis, Purple Mountain Milk-Vetch, | Oxytropis halleri | Fabaceae \ Schmetterlingsblütler / Legumes |  | A 
F | 
| Oxytropis, Three-Flowered | Oxytropis triflora | Fabaceae \ Schmetterlingsblütler / Legumes |  | A | 
| Oxytropis, Velvet | Oxytropis velutina | Fabaceae \ Schmetterlingsblütler / Legumes |  | F | 
| Oxytropis, Yellow | Oxytropis campestris | Fabaceae \ Schmetterlingsblütler / Legumes |  | A 
I | 
| Oxytropis | Oxytropis helvetica | Fabaceae \ Schmetterlingsblütler / Legumes |  | F | 
| Oxytropis | Oxytropis jacquinii | Fabaceae \ Schmetterlingsblütler / Legumes |  | A 
I | 
|  | Oxytropis | Oxytropis lapponica | Fabaceae \ Schmetterlingsblütler / Legumes |  | A | 
| Oxytropis | Oxytropis neglecta | Fabaceae \ Schmetterlingsblütler / Legumes |  | A | 
| Oxytropis | Oxytropis pilosa | Fabaceae \ Schmetterlingsblütler / Legumes |  | A 
D 
F | 
| Oyster Thief | Colpomenia peregrina | Fucaceae \ Braun-Algen / Seaweeds |  | NL | 
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