O
Last updated October 1, 2009
| Name | Family | Nativity |
| Ochagavia carnea | Bromeliaceae | Chile |
| Ochna serrulata | Ochnaceae | South Africa |
| Odontonema strictum | Acanthaceae | Central America |
| Oenothera sp. | Onagraceae | |
| Oenothera speciosa | Onagraceae | SW United States, Mexico |
| Olea europaea | Oleaceae | Mediterranean |
| Olea europaea cv. Manzanillo | Oleaceae | |
| Olea exasperata | Oleaceae | South Africa |
| Olmediella betschleriana | Flacourtiaceae | Guatemala |
| Oncidium flexuosum | Orchidaceae | Brazil |
| Oncidium sp. | Orchidaceae | |
| Oncidium splendidum | Orchidaceae | Guatemala |
| Operculicarya decaryi | Anacardiaceae | Madagascar |
| Ophiopogon japonicus | Convallariaceae | Japan |
| Ophiopogon japonicus cv. Nana | Convallariaceae | |
| Opuntia auberi | Cactaceae | Mexico, Cuba |
| Opuntia basilaris | Cactaceae | SW United States |
| Opuntia basilaris v. treleasei | Cactaceae | SW United States |
| Opuntia caracassana | Cactaceae | Venezuela |
| Opuntia caribaea | Cactaceae | Dominican Republic |
| Opuntia decumbens | Cactaceae | S Mexico to Costa Rica |
| Opuntia dillenii | Cactaceae | SE US to Mex., Ecuador, Carib. |
| Opuntia echios | Cactaceae | Galapagos Islands |
| Opuntia echios v. gigantea | Cactaceae | Galapagos Islands |
| Opuntia elata | Cactaceae | Paraguay |
| Opuntia engelmannii v. cv. linguiformis | Cactaceae | Cen Texas |
| Opuntia engelmannii v. linguiformis | Cactaceae | |
| Opuntia galapageia | Cactaceae | Galapagos Islands |
| Opuntia galapageia v. galapageia | Cactaceae | Galapagos Islands |
| Opuntia gosseliniana | Cactaceae | Arizona to NW Mexico |
| Opuntia helleri | Cactaceae | Galapagos Islands |
| Opuntia lutea | Cactaceae | Mexico to Nicaragua |
| Opuntia megasperma v. megasperma | Cactaceae | Galapagos Islands |
| Opuntia megasperma v. mesophytica | Cactaceae | Galapagos Islands |
| Opuntia microdasys | Cactaceae | N Mexico |
| Opuntia microdasys v. monstrosa | Cactaceae | N Mexico |
| Opuntia microdasys v. rufida | Cactaceae | N Mexico |
| Opuntia quimilo | Cactaceae | N Argentina, Bolivia |
| Opuntia robusta | Cactaceae | Cen Mexico |
| Opuntia sp. | Cactaceae | |
| Opuntia sp. | Cactaceae | Galapagos Islands |
| Opuntia tomentosa | Cactaceae | Mexico, Guatemala |
| Oreocereus celsianus | Cactaceae | Bolivia, Peru, N Argentina |
| Oreocereus celsianus v. fossulatus | Cactaceae | Bolivia, Peru, N Argentina |
| Oreocereus doelzianus | Cactaceae | Cen Peru |
| Oreocereus hendriksenianus | Cactaceae | Chile, S Peru |
| Oreocereus hendriksenianus v. densilanatus | Cactaceae | Chile, S Peru |
| Oreocereus hybrid | Cactaceae | |
| Oreocereus leucotrichus | Cactaceae | Chile, S Peru |
| Oreocereus sp. | Cactaceae | |
| Oreocereus trollii | Cactaceae | N Argentina |
| Origanum dictamnus | Lamiaceae | Greece |
| Ornithogalum longibracteatum | Hyacinthaceae | South Africa |
| Ornithogalum viveus | Hyacinthaceae | |
| Orthophytum cv. Copper Penny | Bromeliaceae | |
| Orthophytum gurkenii | Bromeliaceae | E Brazil |
| Orthophytum lemei | Bromeliaceae | Brazil |
| Orthophytum vagans | Bromeliaceae | Brazil |
| Osmanthus fragrans | Oleaceae | E Asia |
| Osmanthus heterophylla cv. Argenteo-marginata | Oleaceae | |
| Osmunda regalis cv. Purpurescens | Osmundaceae | |
| Otatea acuminata ssp. aztecorum | Poaceae | Mexico to Nicaragua |
| Otatea glauca | Poaceae | Mexico(Chiapas) |
| Otholobium fruticans | Fabaceae | South Africa |
| Othonna protecta | Asteraceae | South Africa, Namibia |
| Oxalis carnosa | Oxalidaceae | Bolivia, Chile, Peru,Galapagos |
| Oxalis gigantea | Oxalidaceae | Chile |
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Ganna Walska died March 2, 1984, at Lotusland, leaving her garden and her entire estate to the Ganna Walska Lotusland Foundation, to insure that her legacy would remain in her gardens.