Index
- Oclemena reticulata, white-top aster
- Ocotea coriacea, lancewood
- Oeceoclades maculata, ground orchid, monk orchid
- Oenothera biennis, common evening evening primrose
- Oenothera grandiflora, eveningprimrose
- Oenothera humifusa, seaside evening primrose
- Oenothera laciniata, cut-leaf evening primrose
- Oenothera speciosa, showy primrose
- Oldenlandia uniflora, clustered mille graines
- Onoclea sensibilis, sensitive fern
- Ophioglossum palmatum, hand fern
- Oplismenus hirtellus, bristle basketgrass
- Opuntia corallicola, semaphore cactus
- Opuntia cubensis, bullsuckers
- Opuntia humifusa, prickly-pear cactus
- Opuntia spinosissima, Florida semaphore cactus
- Opuntia stricta, erect prickly-pear cactus
- Orobanche uniflora, broomrape
- Orontium aquaticum, golden-club, neverwet
- Osmunda cinnamomea, cinnamon fern
- Osmunda regalis var. spectabilis, royal fern
- Ostrya virginiana, American hophornbeam
- Oxalis corniculata, lady sorrell, creeping wood sorrell
- Oxalis debilis var. corymbosa, violet wood-sorrellell
- Oxalis latifolia, Cuban purple wood sorrel
- Oxalis lyonii, sorrell
- Oxalis violacea, violet wood sorrel
- Oxydendrum arboreum, sourwood
- Oxypolis filiformis, water-dropwort
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