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Osmunda spectabilis

Brachyglottis pentacopa

Oryza longistaminata

Ottelia alismoides

Duck-lettuce

Oxalis frutescens

Shrubby woodsorrel

Oxalis corniculata

Creeping wood-sorrel

Oxalis debilis

Large-flower pink-sorrel

Oxalis dillenii

Slender yellow wood-sorrel

Oxalis grandis

Great yellow woodsorrel

Oxalis hirta

Tropical woodsorrel

Oxalis incarnata

Lilac oxalis

Oxalis alpina

Ottochloa nodosa

Oxalis acetosella

Irish shamrock

Oxalis oregana

Redwood-sorrel

Oxalis rosea

Sorrel

Oxalis trilliifolia

Threeleaf woodsorrel

Oxydendrum arboreum

Sourwood

Oxypetalum coeruleum

Southern star

Oxyria digyna

Alpine mountain-sorrel