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| * Oenothera * - Teunisbloem - |
| Oenothera odorata “Apricot Delight” | |
| Oenothera versicolor “Sunset Boulevard” | |
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| Onoclea sensibilis - Bolletjesvaren - | |
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| * Ophiopogon * - Slangenbaard - |
| Ophiopogon bodinieri B&L12505 | |
| Ophiopogon planiscapus | |
| Ophiopogon planiscapus “Niger” | |
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| * Origanum * - Oregano of Marjolein - |
| Origanum "Rosenkuppel" | |
| Origanum vulgare | |
| Origanum vulgare “Alba” | |
| Origanum vulgare “Compactum” | |
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| Osmunda regalis - Koningsvaren - | |
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