Schoenoplectus torreyi (Olney) Palla
Family: Cyperaceae
Torrey's bulrush, Torrey's three-square bulrush
[Scirpus torreyi Olney]
Schoenoplectus torreyi image
from USDA Plants website  
Schoenoplectus torreyi image
University of Wisconsin - Madison (WIS-VP)  
Etymology: Schoenoplectus: Greek a 'rush leek' ' plecto for "plaited, twisted" schoenos for "rush or reed"
Plants: erect, perennial, to 5' tall, semi-aquatic sedge; stems triangular; soft rhizomes
Leaves: merely short sheaths at stem base
Flowers: inflorescence tight clustered spikelet from side of bract at stem top, spikelet of sharp-pointed yellow-brown scales
Fruits: nutlet, with 2 bristles, blunt beak
Habitat: wet; marshes shores in water 2'-3' deep
Conservation Status: Special Concern