All images and text are © 20032- 2006, Gary Fewless.

The Wisconsin distribution maps were produced by the UW-Madison Herbarium and are based on the voucher specimens held by the following herbaria: UW-Madison (WIS), UW-Green Bay, UW-Stevens Point, and UW-Superior; Milwaukee Public Museum (MIL); Fort McCoy; Illinois Natural History Survey; SE Wisconsin Regional Planning Commission; WIS-DNR; Morton Arboretum (MOR); and various other Wisconsin collections. The distributions shown are based primarily on locations for which a herbarium voucher is known. It is likely that current and future botanists will improve the record of distributions.