| Ονομασία | Υποείδος | Κοινή ονομασία | Φωτογραφία | |
|---|---|---|---|---|
| Orobanche major |
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| Orobanche minor |
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| Orobanche pancicii |
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| Orobanche pubescens | Οροβάγχη η χνουδωτή |
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| Orobanche purpurea |
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| Orobanche ramosa | mutelii |
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| Orobanche ramosa | nana |
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| Orobanche ramosa | ramosa |
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| Orobanche rechingeri |
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| Orobanche reticulata |
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| Orobanche sanguinea |
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| Orobanche schultzii |
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| Orthilia secunda |
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| Osmunda regalis |
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| Ostrya carpinifolia | Οστρυά |
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| Osyris alba | Όσυρις |
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| Otanthus maritimus |
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| Oxalis acetosella |
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| Oxalis articulata |
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| Oxalis corniculata |
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