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- Olida (Eucalyptus olida) (Australia)
- Oregano (Origanum vulgare, O. heracleoticum, and other species)
- Orris root (Iris germanica, I. florentina, I. pallida)
Read more about this topic: List Of Culinary Herbs And Spices
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Read more about this topic: List Of Culinary Herbs And Spices