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Plants
| Title | Common Name |
|---|---|
| Onopordum acanthium | Cardo Timonero; Chardon Aux Anes; Krebsdistel; Toba; Tobah; Schotse Distel; Cotton Thistle; Cardo Borriquero; Scotch Thistle; Cardo Asinino; Wegdistel; Eselsdistel; Acanzio; Acanto Bastardo |
| Onopordum sp | Cotton Thistle |
| Ophiorrhiza mungos | Sarahati |
| Opopanax chironium | Opopanax; Panace |
| Opopanax pastinaca | Opopanax |
| Origanum dictamnus | Dittany; Mangirotu |
| Origanum majorana | Mercenkosk; Marjoram; Marjolaine; Mayorana; Mayorana-So; Origanium |
| Origanum vulgare | Pot Marjoram; Marjoram,Wild; Adi Mercankosk; Marjolaine; Oregano De Espana; Raihana Kiwilka; Raihan Jabaili; Oregano |
| Orobanche americana | Squawroot |
| Orobanche major | Orabanca; Broomrape; Erva Toira |
| Orobanche rapum-genistae | not available |
| Orobanche uniflora | Cancer Drops |
| Orostachys japonicus | not available |
| Orostachys macrophyllus | not available |
| Oxalis acetosella | Wood Sorrel; Woodsorrel; Kazayagi; Aleluya; Sorrel |
| Oxalis amplifolia | not available |
| Oxalis martiana | Sheep Shar |
| Oxalis montana | Woodsorrel,Common |
| Oxalis trilliifolia | not available |
| Oxyria digyna | Sourdock,Boreal |