7 km North of Highway 3 on Silica Sands Road, East of Hudson Bay
This is the emergent part of the plant.
I am not convinced of my identification of this specimen. Various authors have subdivided this genus in different ways. See here for a table of characteristics of species similar to S. angustifolium. The sources of the information in the table are the Flora of North America and Plants of the Western Boreal Forest & Aspen Parkland.