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Reset Filters| Scientific Name | Class | Order | Family |
|---|---|---|---|
| Opuntia atrispina | Magnoliopsida | Caryophyllales | Cactaceae |
| Orobanche crenata | Magnoliopsida | Lamiales | Orobanchaceae |
| Orthocarpus luteus | Magnoliopsida | Lamiales | Orobanchaceae |
| Oryza australiensis | Magnoliopsida | Poales | Poaceae |
| Oryza barthii | Magnoliopsida | Poales | Poaceae |
| Oryza latifolia | Magnoliopsida | Poales | Poaceae |
| Oryza longistaminata | Magnoliopsida | Poales | Poaceae |
| Oryza minuta | Magnoliopsida | Poales | Poaceae |
| Oryza officinalis | Magnoliopsida | Poales | Poaceae |
| Oryza rufipogon | Magnoliopsida | Poales | Poaceae |
| Osbornia octodonta | Magnoliopsida | Myrtales | Myrtaceae |
| Osmorhiza berteroi | Magnoliopsida | Apiales | Apiaceae |
| Osmundastrum cinnamomeum | Polypodiopsida | Osmundales | Osmundaceae |
| Osodendron altissimum | Magnoliopsida | Fabales | Fabaceae |
| Ostrya | Magnoliopsida | Fagales | Betulaceae |
| Ouret lanata | Magnoliopsida | Caryophyllales | Amaranthaceae |
| Owenia venosa | Magnoliopsida | Sapindales | Meliaceae |
| Oxalis corniculata | Magnoliopsida | Oxalidales | Oxalidaceae |
| Oxalis divaricata | Magnoliopsida | Oxalidales | Oxalidaceae |
| Oxalis latifolia | Magnoliopsida | Oxalidales | Oxalidaceae |