| Plant tribes (Op - Ot) |
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| Rubiineae > Rubiaceae > Opercularioideae |
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| adder's tongue, adderstongue |
| Ophioglossales > Ophioglossaceae > Ophioglossoideae |
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| dwarf mondo grass, lilyturf, ophiopogon |
| Asparagales > Ophiopogonaceae > Ophiopogonoideae |
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| Apocynales > Apocynaceae > Ophioxyloideae |
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| Juncanae > Poales > Poaceae |
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| Orchidineae > Orchidaceae > Ophrydoideae |
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| Santalanae > Santalales > Opiliaceae |
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| barbary fig, cactus, cholla, duraznillo, olaga, pricklypear, tiger-pear |
| Cactineae > Cactaceae > Opuntioideae |
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| Hawai'i Island sedge, oreobolus |
| Juncanae > Cyperales > Cyperaceae |
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| Magnoliidae > Lauranae > Laurales |
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| broomrape, hellroot |
| Lamiales > Orobanchaceae > Orobanchoideae |
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| goldenclub |
| Arales > Araceae > Orontioideae |
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| rice |
| Poales > Poaceae > Oryzoideae |
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| Myrtales > Melastomataceae > Osbeckioideae |
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| buckhorn, fern, fiddleheads, osmunda |
| Osmundineae > Osmundaceae > Osmundoideae |
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| daisybush, stinking roger |
| Asteranae > Asterales > Asteraceae |
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| Santalineae > Santalaceae > Osyridoideae |
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| Asterales > Asteraceae > Othonnoideae |
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