Plants by botanic name
Below is a list of plant names beginning with the letter 'O', listed by scientific/botanical (Latin) name. Click a letter of the alphabet to see a list of plants with botanic / latin names beginning with that letter. Alternatively click here to see the plants listed alphabetically by common name.
| Botanic name | Common name(s) |
|---|---|
| Ochagavia carnea | Tresco rhodostachys |
| Ocimum basilicum | Basil, Sweet basil, Common basil |
| Ocimum basilicum 'Mrs Burn's' | Basil |
| Ocimum basilicum 'Siam Queen' | Basil, Common sweet basil |
| Ocimum basilicum 'Sweet Italian' | Basil |
| Ocimum basilicum var. purpurascens 'Purple Ruffles' | Basil, Purple leafed basil |
| Ocimum minimum 'Aristotle' | Greek basil, Bush basil, Basil |
| Oemleria cerasiformis | Oso Berry |
| Oenanthe crocata | Hemlock water dropwort, Water hemlock, Dead man's fingers |
| Oenanthe javanica | Japanese parsley, Mitsuba, Chinese celery |
| Oenanthe pimpinelloides | Corky-Fruited Water Dropwort |
| Oenothera | Evening primrose |
| Oenothera biennis | Evening primrose |
| Olea africana | African olive |
| Olea europaea subsp. cuspidata | African Olive |
| Olea europea | Olive |
| Olearia macrodonta | Daisy bush |
| Olearia nummulariifolia | Daisy bush |
| Omphalodes cappadocica 'Cherry Ingram' | Navelwort |
| Oncidium | Orchid |
| Onobrychis viciifolia | Sainfoin |
| Onoclea sensibilis | Sensitive fern |
| Onopordum acanthium | Scotch Thistle |
| Ophiopogon planiscapus | Black Mondo, Lilyturf |
| Ophiopogon planiscapus 'Nigrescens' | Black turf lily, Ornamental grass |
| Ophrys apifera | Bee orchid |
| Ophrys fuciflora | Late spider orchid |
| Ophrys insectifera | Fly orchid |
| Ophrys sphegodes | Early spider orchid |
| Opuntia ficus-indica | Barbary fig, Prickly pear |
| Orchidaceae 'Versailles' | Orchid |
| Orchis anthropophorum | Man orchid |
| Orchis laxiflora | Loose flowered orchid |
| Orchis mascula | Early purple orchid |
| Orchis militaris | Military orchid |
| Orchis morio | Green winged orchid |
| Orchis purpurea | Lady orchid |
| Orchis simia | Monkey orchid |
| Orchis ustulata | Burnt orchid |
| Origanum aurreum | Golden majoram |
| Origanum dictamnus | Cretan Dittany, Dittany of Crete, Hop Marjoram |
| Origanum majorana | Sweet marjoram |
| Origanum onites | Pot marjoram |
| Origanum vulgare | Oregano, Majoram, Wild marjoram |
| Origanum vulgare 'Daphne Ffiske' | Marjoram |
| Origanum vulgare 'Gold Tip' | Gold tipped marjoram |
| Origanum vulgare var. compactum | Compact Marjoram |
| Orlaya grandiflora | White laceflower |
| Ornithogalum angustifolium | Star of Bethlehem |
| Ornithogalum nutans | Drooping star of Bethlehem |
| Ornithogalum pyrenaicum | Spiked star of Bethlehem |
| Oryza sativa | Rice, Asian rice |
| Oryzopsis miliacea | Smilo grass |
| Osmanthus heterophyllus | False holly |
| Osmanthus heterophyllus 'Goshiki' | False holly |
| Osmunda regalis | Royal fern |
| Osteospermum | Cape daisy, African daisy |
| Oxalis | Shamrock |
| Oxalis versicolor | Candy cane sorrel |
