Recently segregated from Schoenoplectus, this includes, in Michigan, all the annual, cespitose species. See Hayasaka (2012) and Shiels & Monfils (2012) for further information.

1. Culms sharply triangular.

S. mucronata

1. Culms terete or obscurely 3-angled.

2. Achene covered with prominent transverse ridges; perianth bristles none.

S. hallii

2. Achene smooth or obscurely pitted; perianth bristles present or absent.

3. Taller shoots with stems (base of plant to inflorescence) (0.7–) 0.75–0.9 as long as the entire shoot, including the involucral bract; achenes thickly and asymmetrically biconvex (inner face slightly but clearly convex, outer faces forming a clear angle).

S. purshiana

3. Taller shoots with stems 0.4–0.75 (–0.8) as long as the entire shoot; achenes flattened-planoconvex (inner face essentially flat, the outer faces gently rounded).

S. smithii

All species found in Schoenoplectiella

Schoenoplectiella halliiHALL'S BULRUSH 
Schoenoplectiella mucronataBOG BULRUSH 
Schoenoplectiella purshianaPURSH'S TUFTED BULRUSH 
Schoenoplectiella smithiiBULRUSH 


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. March 29, 2017.