Science magazines
- Cave Crayfish (Cambarus aculabrum)
- Cave Crayfish (Cambarus zophonastes)
- Central American River Turtle
- Chamaecrista Glandulosa Var. Mirabilis
- Chamaesyce Halemanui
- Chapman's Rhododendron
- Cheat Mountain Salamander
- Cherokee Darter
- Chihuahua Chub
- Chinese Camp Brodiaea
- Chinook Salmon
- Chipola Slabshell
- Chisos Mountain Hedgehog Cactus
- Chittenango Ovate Amber Snail
- Choctawhatchee Beach Mouse
- Chorro Creek Bog Thistle
- Chum Salmon
- Chupacallos
- Clara Hunt's Milk-vetch
- Clay Phacelia