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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