Epithets
| occulta | hidden |
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| odorata | fragrant,scented |
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| odoratus | fragrant,scented |
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| odorus | fragrant,scented |
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| officinalis | sold as an herb; medicinal |
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| orbicularis | circular |
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| orbiculatus | circular |
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| orbiculus | circular |
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| oreophila | mountain loving |
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| oreophilum | mountain loving |
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| osteosperma | bony seed |
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| osteospermus | bony seed |
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| oxy- | prefix meaning "sharp, pointed" |
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| pachy- | prefix meaning "thick" |
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| pallida | pale |