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Opuntia macrocentra

Martin's blunt-spine prickly-pear

Opuntia microdasys

Bunny-ears prickly-pear

Opuntia monacantha

Common pricklypear

Opuntia oricola

Chaparral pricklypear

Opuntia phaeacantha

New mexico prickly-pear

Opuntia polyacantha

Cliff prickly-pear

Opuntia rufida

Isachne fera

Opuntia stricta

Erect prickly-pear

Opuntia triacantha

Spanish lady

Orcuttia californica

California orcutt grass

Oreostemma elatum

Plumas mountaincrown

Origanum majorana

Pot marjoram

Origanum vulgare

Wild marjoram

Ornithogalum pyrenaicum

Spiked star-of-bethlehem

Ornithogalum umbellatum

Garden star-of-bethlehem

Ormocarpum cochinchinense

Phanera bassacensis var. bassacensis

Aralia gintungensis

Orobanche hederae

Ivy broomrape