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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

Cartrema americana

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