Osmunda regalis
From Wiktionary, the free dictionary
Proper noun
- A taxonomic species within the family Osmundaceae – royal fern.
References
Osmunda regalis on Wikipedia.Wikipedia 
Osmunda regalis on Wikispecies.Wikispecies 
Osmunda regalis on Wikimedia Commons.Wikimedia Commons - Osmunda regalis at USDA Plants database
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