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Plants
| Title | Common Name |
|---|---|
| Oenanthe sp | Water Dropwort |
| Oenothera odorata | not available |
| Oenothera tetraptera | not available |
| Omphalea lapidecens | not available |
| Onoclea sensibilis | Sensitive Fern |
| Oonopsis sp | Goldenweed |
| Operculina ruberosa | not available |
| Oplopanax horridum | not available |
| Orbignya cohune | not available |
| Origanum majorana | Mercenkosk; Marjoram; Marjolaine; Mayorana; Mayorana-So; Origanium |
| Ormosia coccinea | Bead Tree |
| Ornithogalum longibracteatum | not available |
| Ornithogalum umbellatum | Leche De Gallina; Star-Of-Bethlehem |
| Osmorhiza chilensis | not available |
| Oxalis acetosella | Wood Sorrel; Woodsorrel; Kazayagi; Aleluya; Sorrel |
| Oxalis corniculata | Alleluia; Oseille Marron; Tso Chiang; Hsiao Suan Ts'Ai; Oseille Du Bois; Indian Sorrel; Suan Chiang; Rempi; Carpigna; Hummaidh; Sorrel; Estrebolina; Sikap dada; Pwin D'Coucou; Vinagrillo; Chukrika; Semanggen; Acederilla Aleluya; Vinagreta |
| Oxalis pes-caprae | Sorrel |
| Oxytenia acerosa | Copperweed |
| Pachyrhizus erosus | Bengkowang; Hoewihiris; Yambean; Auyey; Sengkuwang |
| Pachystachys coccinea | not available |