| 1 | Native | Northern America | Eastern Canada | Canada | New Brunswick | | Hinds, H. R. 2000. Flora of New Brunswick, ed. 2. |
| 1 | Native | Northern America | Eastern Canada | Canada | Newfoundland and Labrador | | Scoggan, H. J. 1978-1979. The flora of Canada, 4 vol. |
| 1 | Native | Northern America | Eastern Canada | Canada | Nova Scotia | | Scoggan, H. J. 1978-1979. The flora of Canada, 4 vol. |
| 1 | Native | Northern America | Eastern Canada | Canada | Ontario | | Scoggan, H. J. 1978-1979. The flora of Canada, 4 vol. |
| 1 | Native | Northern America | Eastern Canada | Canada | Prince Edward Island | | Scoggan, H. J. 1978-1979. The flora of Canada, 4 vol. |
| 1 | Native | Northern America | Eastern Canada | Canada | Québec | | Scoggan, H. J. 1978-1979. The flora of Canada, 4 vol. |
| 1 | Native | Northern America | North-Central U.S.A. | United States | Illinois | | Jones, G. N. & G. D. Fuller. 1955. Vascular plants of Illinois. |
| 1 | Native | Northern America | North-Central U.S.A. | United States | Iowa | | |
| 1 | Native | Northern America | North-Central U.S.A. | United States | Kansas | | McGregor, R. L. et al. (The Great Plains Flora Association). 1986. Flora of the Great Plains. |
| 1 | Native | Northern America | North-Central U.S.A. | United States | Minnesota | | |
| 1 | Native | Northern America | North-Central U.S.A. | United States | Missouri | | |
| 1 | Native | Northern America | North-Central U.S.A. | United States | Nebraska | | McGregor, R. L. et al. (The Great Plains Flora Association). 1986. Flora of the Great Plains. |
| 1 | Native | Northern America | North-Central U.S.A. | United States | North Dakota | | McGregor, R. L. et al. (The Great Plains Flora Association). 1986. Flora of the Great Plains. |
| 1 | Native | Northern America | North-Central U.S.A. | United States | Oklahoma | | McGregor, R. L. et al. (The Great Plains Flora Association). 1986. Flora of the Great Plains. |
| 1 | Native | Northern America | North-Central U.S.A. | United States | South Dakota | | McGregor, R. L. et al. (The Great Plains Flora Association). 1986. Flora of the Great Plains. |
| 1 | Native | Northern America | North-Central U.S.A. | United States | Wisconsin | | |
| 1 | Native | Northern America | Northeastern U.S.A. | United States | Connecticut | | Magee, D. W. & H. E. Ahles. 1999. Flora of the Northeast. A manual of the vascular flora of New England and adjacent New York. |
| 1 | Native | Northern America | Northeastern U.S.A. | United States | Indiana | | |
| 1 | Native | Northern America | Northeastern U.S.A. | United States | Maine | | Magee, D. W. & H. E. Ahles. 1999. Flora of the Northeast. A manual of the vascular flora of New England and adjacent New York. |
| 1 | Native | Northern America | Northeastern U.S.A. | United States | Massachusetts | | Magee, D. W. & H. E. Ahles. 1999. Flora of the Northeast. A manual of the vascular flora of New England and adjacent New York. |
| 1 | Native | Northern America | Northeastern U.S.A. | United States | Michigan | | Voss, E. 1972-. Michigan flora. |
| 1 | Native | Northern America | Northeastern U.S.A. | United States | New Hampshire | | Magee, D. W. & H. E. Ahles. 1999. Flora of the Northeast. A manual of the vascular flora of New England and adjacent New York. |
| 1 | Native | Northern America | Northeastern U.S.A. | United States | New Jersey | | |
| 1 | Native | Northern America | Northeastern U.S.A. | United States | New York | | |
| 1 | Native | Northern America | Northeastern U.S.A. | United States | Ohio | | Ohio Flora Committee (E. L. Braun, T. S. Cooperrider, T. R. Fisher, J. J. Furlow). 1967-. The vascular flora of Ohio. |
| 1 | Native | Northern America | Northeastern U.S.A. | United States | Pennsylvania | | |
| 1 | Native | Northern America | Northeastern U.S.A. | United States | Vermont | | Magee, D. W. & H. E. Ahles. 1999. Flora of the Northeast. A manual of the vascular flora of New England and adjacent New York. |
| 1 | Native | Northern America | Northeastern U.S.A. | United States | West Virginia | | Strausbaugh, T. D. & E. L. Core. 1978. Flora of West Virginia, ed. 2. |
| 1 | Native | Northern America | Northwestern U.S.A. | United States | Colorado | | |
| 1 | Native | Northern America | Northwestern U.S.A. | United States | Idaho | | |
| 1 | Native | Northern America | Northwestern U.S.A. | United States | Montana | | |
| 1 | Native | Northern America | Northwestern U.S.A. | United States | Oregon | | |
| 1 | Native | Northern America | Northwestern U.S.A. | United States | Washington | | |
| 1 | Native | Northern America | Northwestern U.S.A. | United States | Wyoming | | |
| 1 | Native | Northern America | South-Central U.S.A. | United States | New Mexico | | |
| 1 | Native | Northern America | South-Central U.S.A. | United States | Texas | | Diggs, G. M., Jr. et al. 1999. Shinner's and Mahler's illustrated flora of North Central Texas. |
| 1 | Native | Northern America | Southeastern U.S.A. | United States | Alabama | | |
| 1 | Native | Northern America | Southeastern U.S.A. | United States | Arkansas | | |
| 1 | Native | Northern America | Southeastern U.S.A. | United States | Florida | | |
| 1 | Native | Northern America | Southeastern U.S.A. | United States | Georgia | | |
| 1 | Native | Northern America | Southeastern U.S.A. | United States | Kentucky | | |
| 1 | Native | Northern America | Southeastern U.S.A. | United States | Louisiana | | |
| 1 | Native | Northern America | Southeastern U.S.A. | United States | Maryland | | |
| 1 | Native | Northern America | Southeastern U.S.A. | United States | Mississippi | | |
| 1 | Native | Northern America | Southeastern U.S.A. | United States | North Carolina | | Radford, A. E. et al. 1964. Manual of the vascular flora of the Carolinas. Note: = Viola palmata var. sororia (Willd.) Pollard |
| 1 | Native | Northern America | Southeastern U.S.A. | United States | South Carolina | | Radford, A. E. et al. 1964. Manual of the vascular flora of the Carolinas. Note: = Viola palmata var. sororia (Willd.) Pollard |
| 1 | Native | Northern America | Southeastern U.S.A. | United States | Tennessee | | Wofford, B. E. Database of Tennessee vascular plants (on-line resource). |
| 1 | Native | Northern America | Southeastern U.S.A. | United States | Virginia | | |
| 1 | Native | Northern America | Southwestern U.S.A. | United States | Arizona | | |
| 1 | Native | Northern America | Southwestern U.S.A. | United States | California | | Hickman, J. C., ed. 1993. The Jepson manual: higher plants of California |
| 1 | Native | Northern America | Southwestern U.S.A. | United States | Nevada | | |
| 1 | Native | Northern America | Southwestern U.S.A. | United States | Utah | | |
| 1 | Native | Northern America | Subarctic America | Canada | Northwest Territories | | Scoggan, H. J. 1978-1979. The flora of Canada, 4 vol. |
| 1 | Native | Northern America | Western Canada | Canada | Alberta | | Scoggan, H. J. 1978-1979. The flora of Canada, 4 vol. |
| 1 | Native | Northern America | Western Canada | Canada | British Columbia | | Scoggan, H. J. 1978-1979. The flora of Canada, 4 vol. |
| 1 | Native | Northern America | Western Canada | Canada | Manitoba | | Scoggan, H. J. 1978-1979. The flora of Canada, 4 vol. |
| 1 | Native | Northern America | Western Canada | Canada | Saskatchewan | | Scoggan, H. J. 1978-1979. The flora of Canada, 4 vol. |