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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

Osmanthus heterophyllus

Chinese-holly

Osmunda regalis

Royal fern

Ostrya virginiana

American hop-hornbeam

Oryza rufipogon

Osmadenia tenella

Osteospermum sinuatum