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Coefficient of Conservatism:
5
Coefficient of Wetness:
5
Wetness Index:
UPL
Physiognomy:
Nt Tree
R. W. Smith
Forests of diverse sorts, borders of forests, river banks and floodplains, lake shores, ravines, thickets, hillsides, rocky openings; roadsides, fencerows, fields.
A striking species with very long thorns, to nearly 10 cm in some specimens. Two varieties, often recognized as species, occur in Michigan: var. succulenta (stamens ca. 20, anthers ca. 0.4–0.8 mm long) and var. macracantha (Loud.) Eggl. (stamens ca. 10, anthers ca. 1–1.2 mm long). Var. macracantha is widespread, from the Upper Peninsula into southern Michigan, and var. succulenta is only in the Lower Peninsula.
Locations
Arenac County
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Barry County
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Charlevoix County
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Only on Beaver Island
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Cheboygan County
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Delta County
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Dickinson County
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Emmet County
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Gratiot County
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Hillsdale County
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Ingham County
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Ionia County
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Iosco County
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Iron County
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Kalamazoo County
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Kent County
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Keweenaw County
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Lenawee County
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Livingston County
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Mackinac County
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Macomb County
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Mason County
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Menominee County
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Montcalm County
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Newaygo County
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Oakland County
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Ontonagon County
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Osceola County
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Oscoda County
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Otsego County
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Schoolcraft County
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St. Clair County
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Washtenaw County
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Wayne County
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Citation:
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. January 30, 2023. https://michiganflora.net/species.aspx?id=2476.