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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

Orobanche minor

Clover broomrape

Orontium aquaticum

Golden-club

Orthilia secunda

Serrated-wintergreen

Orthocarpus bracteosus

Rosy owl's-clover

Orthocarpus cuspidatus

Toothed owl's-clover

Orthocarpus tenuifolius

Thinleaved owl's-clover

Orthosiphon aristatus

Whiskerplant

Oryza glaberrima

African rice

Orthocarpus barbatus

Osmanthus fragrans

Sweet osmanthus

Ceanothus integerrimus

Deerbrush ceanothus