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| oat |
| oats |
| oca also called aleluya tuberosa, oxalis tuberosa |
| ocimum |
| ocimum basilicum also called sweet basil, basil |
| ocumo also called malanga, tania, yautia, yautia blanco, xanthosoma sagittifolium, xanthosoma sagittifolia |
| odontoglossum |
| oenothera |
| ofai also called spanish armada, agati, baby boots, gallito, picashia, sesbania grandiflora |
| oil nut also called buffalo nut, rabbitwood, pyrularia pubera |
| oilseed rape also called rape, rapeseeds, brassica napus |
| old-maid also called madagascar periwinkle, rosy periwinkle, catharanthus roseus, vinca rosea |
| olea europaea also called common olive, olea europea |
| olea europea also called common olive, olea europaea |
| one-grained wheat also called einkorn wheat, small spelt, triticum monococcum |
| onion |
| ononis |
| ononis spinosa |
| opium poppy also called papaver somniferum, papaver somniferum l. |
| orbea |
| orchard grass also called cocksfoot, dactylis glomerata |
| orchid family |
| orchidaceae |
| oregano |
| oriental melon also called muskmelon, cucumis melo, cucumis melo var. markuwa markino |
| origanum vulgare |
| orithyia |
| ornamental tobacco also called persian tobacco, indian tobacco, flowering tobacco, winged tobacco, nicotiana alata |
| orobanche |
| orpine also called live-forever, hylotelephium telephium, sedum telephium |
| orthoceras |
| oryctanthus occidentalis |
| oryza |
| oryza glaberrima |
| oryza sativa also called rice, oryza sativa l. |
| oryza sativa (indica cultivar-group) also called indian rice, oryza sativa subsp. indica, oryza sativa indica |
| oryza sativa (japonica culticar-group) also called japanese rice, oryza sativa (japonica cultivar-group), oryza sativa japonica, oryza sativa subsp. japonica |
| oryza sativa (japonica cultivar-group) also called japanese rice, oryza sativa japonica, oryza sativa subsp. japonica, oryza sativa (japonica culticar-group) |
| oryza sativa indica also called indian rice, oryza sativa (indica cultivar-group), oryza sativa subsp. indica |
| oryza sativa japonica also called japanese rice, oryza sativa (japonica cultivar-group), oryza sativa subsp. japonica, oryza sativa (japonica culticar-group) |
| oryza sativa l. also called rice, oryza sativa |
| oryza sativa subsp. indica also called indian rice, oryza sativa (indica cultivar-group), oryza sativa indica |
| oryza sativa subsp. japonica also called japanese rice, oryza sativa (japonica cultivar-group), oryza sativa japonica, oryza sativa (japonica culticar-group) |
| oryza sp. |
| osage orange |
| osha |
| ostreococcus tauri |
| owl's-clover also called indian paintbrush, castilleja |
| oxalis tuberosa also called aleluya tuberosa, oca |
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