1. Coextensive with the genus Ceratophyllum: hornworts
   - family Ceratophyllaceae

Type of: magnoliid dicot family

Part of: order Ranales, order Ranunculales, Ranales, Ranunculales

Encyclopedia: Ceratophyllaceae

• rondelet
• rondo
• rondure
• roneo
• Roneograph
• rongeur
• ronin
• roo
• rood
• rood screen
• rood-tree
• roof
• roof garden
• roof mushroom
• roof of the mouth
• roof peak
• roof rack
• roof rat
• roofed
• roofer
• roofing
• roofing material
• Populus nigra italica
• Populus tremula
• Populus tremuloides