| Oat(s) | Avena |
| Oat(s) | Avena sativa |
| Oat Grass | Arrhenatherum elatius |
| Oat Speargrass | Anisopogon avenaceus |
| One-spiked Paspalum | Paspalum ciliatifolium |
| One-year Grass | Austrostipa macalpinei |
| Onion Twitch | Arrhenatherum elatius |
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