1. Common epiphytic or sometimes terrestrial fern having pale yellow-green strap-shaped leaves; Florida to West Indies and Mexico and south to Uruguay
   - cow-tongue fern, hart's-tongue fern

Type of: strap fern

• genus Radyera
• genus Raffia
• genus Raja
• genus Ramalina
• genus Ramphomicron
• genus Rana
• genus Ranatra
• genus Rangifer
• genus Ranunculus
• genus Raoulia
• genus Raphanus
• genus Raphia
• genus Raphicerus
• genus Raphus
• genus Ratibida
• genus Rattus
• genus Rauvolfia
• genus Rauwolfia
• genus Ravenala
• genus Recurvirostra
• genus Regalecus
• genus Regnellidium
• genus Regulus
• genus Reithrodontomys
• genus Remilegia