Trichophorum cespitosum
 
Tufted Bulrush

Base of Single Shoot

Greenbush Bog, 20 km West of Hudson Bay, SK on Highway #3
02-August-2017

Note the immature shoot at the base of the culm.  Note the blade of the distal leaf has been pulled away from the culm.

I had originally identified this species as Eleocharis quinquefolia.  The correct identification was provided by Anna Leighton and I very much appreciate her doing this.  Anna is currently working on the next fascicle that will be published by the Flora of Saskatchewan Association.  That publication (Rushes, Bulrushes and Pondweeds, plus the remaining Monocots of Saskatchewan by Vern Harms, Anna Leighton and Mary Vetter) will cover both Eleocharis and Trichophorum.