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A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z Obregonia denegrii (Artichoke cactus)
Ochna( 2 taxa)
Ocimum( 2 taxa)
Odontadenia macrantha
Odontonema strictum (Firespike, Cardinal Guard, Scarlet Flame)
Odontospermum
Odostemon
Oehmea
Oenothera( 6 taxa)
Olea europaea (Olive)
Oliverella
Olneya tesota (Ironwood)
Olyra
Omiltemia filisepala
Omphalodes verna (Blue-Eyed Mary, Creeping Forget-Me-Not)
Oncostema peruviana (Peruvian Scilla)
Onoclea sensibilis (Sensitive fern)
Onoseris weberbaueri
Operculicarya( 2 taxa)
Operculina
Ophioglossum
Ophiopogon( 3 taxa)
Ophthalmophyllum dinteri
Opulaster
Opuntia( 214 taxa)
Orbea variegata (Carrion-flower)
Orbeopsis melanantha
Oreobatus
Oreobroma
Oreocereus( 11 taxa)
Origanum( 6 taxa)
Ornithogalum( 4 taxa)
Orontium aquaticum (Golden Club)
Oroya( 2 taxa)
Ortegocactus macdougallii
Ortgiesia
Orthocarpus
Orthophytum hutchinsonianum
Orthopterum coeganum
Oscularia deltoides
Osmanthus( 4 taxa)
Osmunda( 3 taxa)
Osteospermum( 6 taxa)
Ostrya( 2 taxa)
Otacanthus caeruleus (Amazon Blue, Brazilian Snapdragon)
Otatea acuminata (Mexican Weeping Bamboo)
Othonna( 2 taxa)
Oxalis( 10 taxa)
Oxera pulchella
Oxybaphus
Oxycoccus
Oxydendrum arboreum (Sourwood, Sorrel Tree)
Oxypetalum
Oxystelma
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