1. Cottonwood of western North America with dark green leaves shining above and rusty or silvery beneath
   - black cottonwood, Populus trichocarpa

Type of: cottonwood

• genus Caragana
• genus Caranx
• genus Carassius
• genus Carcharhinus
• genus Carcharias
• genus Carcharodon
• genus Cardamine
• genus Cardiospermum
• genus Cardium
• genus Carduelis
• genus Carduus
• genus Caretta
• genus Carex
• genus Cariama
• genus Carica
• genus Carissa
• genus Carlina
• genus Carnegiea
• genus Carpenteria
• genus Carphophis
• genus Carpinus
• genus Carpobrotus
• genus Carpocapsa
• genus Carpodacus
• genus Carthamus