Willowleaf aster (Symphyotrichum praealtum) COSEWIC status assessment and status report chapter 4
Distribution
Global Range
The variety praealtum, which occurs in Canada, is common in the midwestern United States and extends northward to southwestern Ontario where it reaches its northeastern range limits. The eastern variety (var. angustior) is geographically separate from var. praealtum occurring only in the eastern United States (Figure 2).
Figure 2. Range map of willowleaf aster in North America based on fieldwork, collections and the literature
Canadian Range
Within Canada, the species is found only in the Ontario counties of Lambton, Essex, Middlesex and the Municipality of Chatham-Kent with most of the localities concentrated in the Windsor area and on Walpole Island (Figure 3).
Figure 3. Distribution of willowleaf aster in Ontario based on fieldwork and collections
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