Rank MethodExpertise without calculation
Review Date2016-05-13
Change Date1985-04-05
Edition AuthorsWeldy, Troy W.
Range Extent200,000 to >2,500,000 square km (about 80,000 to >1,000,000 square miles)
Number of Occurrences> 300
Rank ReasonsConsidered common in parts of Canada, Alaska, England, and other circumboreal habitats. Much rarer and sparsely distributed along the southern border of its range.
Range Extent CommentsA circumboreal plant of the upper Midwest and Canada extending south to southern Minnesota, Wisconsin, northern Illinois and northern Iowa. Disjunct populations in the Catskill Mountains of New York.