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Opuntia phaeacantha var. phaeacantha

Opuntia polyacantha var. erinacea

Opuntia stricta var. stricta

Orbexilum pedunculatum

Oreonana clementis

Oreostemma peirsonii

Orthotrichum laevigatum var. kingianum

Opuntia tuna

Tuna

Oreonana purpurascens

Purple mountain-parsley

Oreostemma alpigenum

Tundra aster

Origanum onites

Turkish oregano

Ornithopus perpusillus

Bird's-foot

Opuntia repens

Orthothecium acuminatum

Orobanche corymbosa subsp. corymbosa

Orthotrichum macounii

Ornithogalum nutans

Drooping star-of-bethlehem

Ornithogalum thyrsoides

Christmas-lily

Ornithopus pinnatus

Slender serradella

Ornithostaphylos oppositifolia

Baja california birdbush