- Harbor Springs, West Wequetonsing Nature Preserve1
- Harrison1
- Hastings1
- Hatch Farm1
- Hiawatha National Forest, Ramsey Project Area, between stands 40/936 and 35/990 T41N R20W NW 1/4 of NW 1/4 of sec 11
- Hillman Twp., at west end of Progress St. ¼ mi. W. of State St. in village of Hillman1
- Himachal Pradesh1
- Holland1
- Hot Springs Bay. Tanaga Island1
- Ilak Island1
- In moister places in mixed coniferous woods, along east fork of Potlatch Creek, 10 miles east of Povill, Twp. 41 N, R. 2 E, S. 20.1
- In shallow, stagnant water, heavily shaded; Patricks Creek1
- Indian Bowl area1
- Indian bowl area1
- Inuvik Region1
- Inyo1
- Iran1
- Isle Royal, near Lake Feldman1
- Isle Royale National Park T64N-R38W, Sec. 29, SE of NW of SE.1
- Isle Royale, Head of McCargoe Cove1