Place
- Chilhowee mts., Little River1
- Chisos Mountains, near head of Oak Canyon1
- Clark1
- Cleburne1
- Col. Cannon1
- Collected at Alpine, Cuyamaca Mts1
- Contra Costa1
- Culberson1
- Davidson1
- Davis Mountains, Little Aguja Canyon1
- Echo Lake1
- Ecuador1
- Edwards1
- El Paso Gas Pumping Station, Navajo Indian Reservation, P. O. Saint Michaels1
- Enchanted Rock1
- Essex1
- Estabrook1
- Fishing Creek Pond Dam1
- Fluvanna1
- Foot of mt. Washington1