Oberonia disticha (order Asparagales)
Oceanopteris cartilagineum (order Polypodiales)
Ochradenus baccatus (order Brassicales)
Ocimum gratissimum (order Lamiales)
Ochrolechia alboflavescens (order Pertusariales)
Ochrolechia parella (order Pertusariales)
Ochrolechia turneri (order Pertusariales)
Ochrophlebia cafra (order Orthoptera)
Ocnogyna baetica (order Lepidoptera)
Ocotea coriacea (synonymous, order Laurales)
Octopus rugosus (synonymous, order Octopoda)
Octopus vulgaris (order Octopoda)
Oculina patagonica (order Scleractinia)
Ocydromus gredosanus (order Coleoptera)
Ocypus olens (order Coleoptera)
Ocypus ophthalmicus (order Coleoptera)
Odontonema callistachyum (order Lamiales)
Odontonema strictum (order Lamiales)
Odontura macphersoni (order Orthoptera)
Oeceoclades calcaratus (order Asparagales)
Oecophylla smaragdina (order Hymenoptera)
Oedaleus nigrofasciatus (order Orthoptera)
Oedemera podagrariae (order Coleoptera)
Oedipoda caerulescens (order Orthoptera)
Oedipoda canariensis (order Orthoptera)
Oedipoda fuscocinta (order Orthoptera)
Oenothera biennis (order Myrtales)
Oenothera rosea (order Myrtales)
Oikopleura dioica (order Copelata)
Olax dissitiflora (order Santalales)
Olea capensis (order Lamiales)
Olea europaea (order Lamiales)
Olea europea (order Lamiales)
Olea pallida (order Lamiales)
Olea sylvestris (order Lamiales)
Oleandra neriifolia (order Polypodiales)
Oncocalyx schimperi (order Santalales)
Onoclea orientalis (synonymous, order Polypodiales)
Oncocephalus pilicornis (order Hemiptera)
Oncorhynchus mykiss (order Salmoniformes)
Oncosperma horridum (order Arecales)
Oncosperma tigillarium (order Arecales)
Oncostemum andreanae (order Ericales)
Oncostemum evonymoides (order Ericales)
Oncostemum filicinum (order Ericales)
Oncostemum fusco-pilosum (order Ericales)
Oncostemum reflexum (order Ericales)
Oncostemum sp. A (order Ericales)
Onobrychis viciifolia (order Fabales)
Ononis biflora (order Fabales)
Ononis minutissima (order Fabales)
Ononis natrix (order Fabales)
Ononis spinosa (order Fabales)
Onychognathus tristamii (order Passeriformes)
Opegrapha atrula (synonymous, order Arthoniales)
Opegrapha calcarea (synonymous, order Arthoniales)
Opegrapha chevallieri (synonymous, order Arthoniales)
Opegrapha confluens (synonymous, order Arthoniales)
Opegrapha diaphora (synonymous, order Arthoniales)
Opegrapha lichenoides (synonymous, order Arthoniales)
Opegrapha rimalis (synonymous, order Arthoniales)
Opegrapha varia (order Arthoniales)
Ophioparma ventosa (order Umbilicariales)
Ophiostoma ulmi (order Ophiostomatales)
Ophrys dianica (order Asparagales)
Ophrys fusca (order Asparagales)
Ophrys speculum (order Asparagales)
Ophrys sphegodes (order Asparagales)
Ophrys tenthredinifera (order Asparagales)
Oplodontha viridula (order Diptera)
Opomyza florum (order Diptera)
Opuntia articulata (synonymous, order Caryophyllales)
Opuntia eliator (order Caryophyllales)
Opuntia engelmannii (order Caryophyllales)
Opuntia imbricata (synonymous, order Caryophyllales)
Opuntia microdasys (order Caryophyllales)
Opuntia robusta (synonymous, order Caryophyllales)
Opuntia stricta (order Caryophyllales)
Opuntia subulata (synonymous, order Caryophyllales)
Orania ravaka (order Arecales)
Orbea lutea (order Gentianales)
Orbea variegata (order Gentianales)
Orchis anthropophora (order Asparagales)
Orchis mascula (order Asparagales)
Orchis morio (order Asparagales)
Orchis purpurea (order Asparagales)
Oreina cacaliae (order Coleoptera)
Orenia marismortui (order Halanaerobiales)
Origanum grosii (order Lamiales)
Origanum vulgare (order Lamiales)
Orius sp (order Hemiptera)
Ornithogalum baeticum (order Asparagales)
Ornithogalum bracteatum (synonymous, order Asparagales)
Ornithogalum narbonense (order Asparagales)
Ornithogalum nutans (order Asparagales)
Ornithogalum viridiflorum (synonymous, order Asparagales)
Orobanche latisquama (order Lamiales)
Orobanche lucorum (order Lamiales)
Orobus linifolius (synonymous, order Fabales)
Oropogon cf. diffractaicus (order Lecanorales)
Oropogon loxensis (order Lecanorales)
Orthetrum cancellatum (order Odonata)
Orthetrum chrysostigma (order Odonata)
Orthoceras regulare (order Orthocerida)
Orthopelma luteolator (synonymous, order Hymenoptera)
Orthopelma mediator (order Hymenoptera)
Orthostichella versicolor (order Hypnales)
Orthothecium rufescens (order Hypnales)
Orthotrichum acuminatum (order Orthotrichales)
Orthotrichum anomalum (order Orthotrichales)
Orthotrichum canadense (synonymous, order Orthotrichales)
Orthotrichum cupulatum (order Orthotrichales)
Orthotrichum diaphanum (order Orthotrichales)
Orthotrichum firmum (order Orthotrichales)
Orthotrichum lyellii (order Orthotrichales)
Orthotrichum striatum (order Orthotrichales)
Orthotrichum tenellum (order Orthotrichales)
Oryctes nasicornis (order Coleoptera)
Oryctolagus cuniculus (order Lagomorpha)
Oryza sativa (order Poales)
Oryzopsis miliacea (order Poales)
Osilinus articulatus (order Vetigastropoda)
Osilinus turbinatus (order Vetigastropoda)
Osmanthus fragrans (order Lamiales)
Osmunda regalis (order Osmundales)
Osteospermum ecklonis (synonymous, order Asterales)
Ostrea edulis (order Ostreoida)
Osyris alba (order Santalales)
Osyris lanceolata (order Santalales)
Osyris quadripartita (synonymous, order Santalales)
Otala punctata (order Pulmonata)
Otiorhynchus sp (order Coleoptera)
Otodus obliquus (order Lamniformes)
Oudemansiella mucida (synonymous, order Agaricales)
Ovis aries (synonymous, order Cetartiodactyla)
Ovis orientalis (order Cetartiodactyla)
Oxalis acetosella (order Oxalidales)
Oxalis articulata (order Oxalidales)
Oxalis corniculata (order Oxalidales)
Oxalis pes-caprae (order Oxalidales)
Oxalis rubra (synonymous, order Oxalidales)
Oxycarenus lavaterae (order Hemiptera)
Oxychillus draparnaudi (order Pulmonata)
Oxymirus cursor (order Coleoptera)
Oxyria digyna (order Caryophyllales)
Oxyrrhynchium speciosum (order Hypnales)
Oxythyrea funesta (order Coleoptera)
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