Schoenoplectiella purshiana (Fernald) Lye
Synonym: Scirpus smithii, Schoenoplectus purshianus
Coefficient of Conservatism: 8
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt A-Sedge

Schoenoplectiella purshiana A. A. Reznicek

Included in Scirpus smithii in Michigan Flora.

Sandy to mucky or boggy, sometimes marly, shores and hollows, especially where water levels have receded; frequently associated with Coastal Plain disjuncts such as Rhynchospora scirpoides and Fuirena pumila when in the same habitats. Most specimens of S. purshiana from Michigan have perianth bristles (var. purshiana). Plants without bristles (var. williamsii (Fernald) Hayas.) are known from fluctuating water level shorelines in only a few counties in the southwestern Lower Peninsula (Barry, Berrien, Cass, Kalamazoo, and Van Buren). Apparently almost never co-occurring with the bristled form; only at Daggett Lake, Barry Co., have both been collected (though in different years). 

Especially when plants are robust, the single involucral bract is often bent or even reflexed in S. purshiana, while that of S. smithii is ± straight. Also, the bristles of S. purshiana, when present, are clearly tapered to a wider base and often longer than the achene. Bristles of S. smithii are about the same width for most of their length and are sometimes shorter than the achene.


Allegan County
Barry County
Berrien County
Cass County
Iron County
Kalamazoo County
Kent County
Muskegon County
Newaygo County
Oakland County
Ontonagon County
Schoolcraft County
Van Buren County
Wayne County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. July 27, 2021.