Place
- Cheshire1
- Chiriquí1
- Clarke1
- Clifton1
- Cochrane1
- Cockburn Island1
- Collected in and around El Boquete.1
- Coppermine, Coronation Gulf, at mouth of Coppermine River, back of the village.1
- Cotopaxi1
- Crystal Falls, near1
- Cumberland Falls1
- Delta1
- Detroit1
- Disturbed corner of dirt road in Mackinac St. Forest; T43N, R10W, sec. 33.1
- Disturbed corner of dirt road in Mackinac State Forest; T43N, R10W, sec 33.1
- Dunes at Keiser1
- Echo Bay, NW of1
- Eleven miles north of St. Ignace.1
- En las taludes rocosos y húmedos del camino de Sayoya; en Guajalito1
- Essex1