Both Viola papilionacea Pursh and V. nephrophylla Greene are fairly common and well-known acaulescent blue violets of northeastern and midwestern United States. V. papilionacea, the common blue violet, is found from Maine to Minnesota and thence southward to Oklahoma and Georgia. In the midwestern prairies the somewhat smaller plants are sometimes called var. pratincola. V. nephrophylla, though not so abundant locally, is much more widespread, occurring from Newfoundland to British Columbia and southward to northern New York, Michigan, northern Iowa, North Dakota, and, in the west, south along the mountains to Arizona and southern California (Fernald, 1950).
Proceedings of the Iowa Academy of Science
©1952 Iowa Academy of Science, Inc.
Russell, Norman H.
"An Example of lntrogressive Hybridization Between Viola Papilionacea Pursh and V. Nephrophylla Greene,"
Proceedings of the Iowa Academy of Science, 59(1), 134-140.
Available at: https://scholarworks.uni.edu/pias/vol59/iss1/16