Shaker : Vascular Flora of Allegheny County. 113 



SAGITTARIA Linnaeus. 



* S. latifolia Willdenow. Broad arrow-leaf. 

 S. variabilis Engelmann. 



NAIADACE^ Lindley. 

 PONDWEED FAMILY. III-3. 



POTAMOGETON Linnsus. 



* P. natans Linnaeus. Common floating pondweed. 



CYPERACEiE J. St. Hilaire. 

 SEDGE FAMILY. III-8. 



CYPERUS Linn^us. 



* C. flavescens Linnaeus. Yellow cyperus. 



* C. diandnis Torrey. Low cyperus. 



* C. rivularis Kunth. Shining cyperus. 



f C. strigOSUS Linnaeus. Straw-colored cyperus. 



* C. speciosus Vahl. Michaux's cyperus. 



ELEOCHARIS R. Brown. 



* E. ovata (Roth). Ovoid spike-rush. 



f E. palustris (Linnaeus). Creeping spike-rush. 



* E. tenuis (Willdenow). Slender spike-rush. 



SCIRPUS Linnaeus. 



* S. lacustris Linnaeus. Great bulrush. 



