Sparganium glomeratum Laestad. ex Beurling
Basis for Former Listing
Sparganium glomeratum is considered a circumboreal species, meaning it occurs in boreal regions around the world. Although this is true, it is perhaps misleading. The species is actually rare or absent from most of the boreal regions of the world, being common only in parts of northern Europe and Asia. In North America, it is found at several locations in Minnesota, a few sites in adjacent Wisconsin, and at scattered sites across Canada.
Basis for Delisting
Since 1996, the known populations of S. glomeratum have more than doubled and the type of habitats it has been documented in, none of which are particularly threatened, has broadened greatly. It is now understood to be much more common and widespread than it was once thought to be and special concern status is no longer necessary. Sparganium glomeratum was delisted in 2013.
References and Additional Information
Cook, C. D. K., and M. S. Nicholls. 1986. A monographic study of the genus Sparganium (Sparganiaceae). Part 1. Subgenus Xanthosparganium Holmberg. Botanica Helvetica 96(2):213-267.
Kaul, R. B. 2000. Sparganium. Pages 271-277 in Flora of North America Editorial Committee, editors. Flora of North America north of Mexico. Volume 22. Oxford University Press, New York, New York.
Minnesota Department of Natural Resources. 2012. Statement of need and reasonableness. Minnesota Department of Natural Resources. Division of Ecological and Water Resources. St. Paul, Minnesota. 337 pp.