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Ononis reclinata

Small restharrow

Ononis speciosa

Onopordum acanthium

Cotton thistle

Onopordum illyricum

Illyrian thistle

Onopordum tauricum

Taurian thistle

Onosma echioides

Goldendrop

Operculina pinnatifida

Tansyleaf lidpod

Operculina turpethum

Transparent wood-rose

Oonopsis multicaulis

Ophioglossum vulgatum

Adder's-tongue

Ophioglossum reticulatum

Netted adderstongue

Ophiopogon japonicus

Dwarf lilyturf

Oplismenus compositus

Running mountaingrass

Oplopanax horridus

Devil's walking-stick

Opuntia atrispina

Border pricklypear

Opuntia aureispina

Rio grande pricklypear

Opuntia basilaris

Bakersfield beaver-tail cactus

Perityle vigilans

Amellus tridactylus

Opuntia engelmannii

Cowtongue cactus