1. Tropical American terrestrial fern with leathery lanceolate fronds; sometimes placed in genus Polybotrya
   - hart's-tongue, hart's-tongue fern, Polybotrya cervina, Polybotria cervina

Type of: fern

• family Clavariaceae
• family Cleridae
• family Clethraceae
• family Clinidae
• family Clupeidae
• family Clusiaceae
• family Cobitidae
• family Coccidae
• family Coccinellidae
• family Coerebidae
• family Colchicaceae
• family Colubridae
• family Columbidae
• family Comatulidae
• family Combretaceae
• family Commelinaceae
• family Compositae
• family Congridae
• family Connaraceae
• family Convallariaceae
• family Convolvulaceae
• family Coprinaceae
• family Coraciidae
• family Cordaitaceae
• family Cordylidae