1. Large deeply rooted fern of worldwide distribution with upright bipinnate compound tufted fronds
   - royal fern, royal osmund, king fern, ditch fern, Osmunda regalis

Type of: flowering fern, osmund

• iridesce
• iridescence
• iridescent
• iridic
• iridium
• iridocyclitis
• iridokeratitis
• iridology
• iridoncus
• Iridoprocne
• Iridoprocne bicolor
• iridosmine
• iridotomy
• iris
• Iris cristata
• iris diaphragm
• iris family
• Iris filifolia
• Iris florentina
• Iris foetidissima
• Iris germanica
• Iris germanica florentina
• Iris kaempferi
• Iris kochii
• Iris Murdoch