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16. CYPERUS. 



CYPE-RUS SPATHACEUS. L. Sheathed Cyperus. 



Culm round, leafy ; leaves alternate, with en- 

 tire sheaths ; racemes axillary and terminal. 



Syn. SCIRPUS SPAYHACEUS. Mich. 



A tall leafy grass. Stem smooth, hardly three sided, cover- 

 ed with numerous short, flat, smooth, spreading leaves, proceed- 

 ing from sheaths -which are perfectly entire or tubular, the 

 part opposite the leaf ending in a rounded point. The lower 

 leaves, not the sheaths, are deciduous. Racemes mostly axil- 

 lary. Peduncle compressed, bearing from five to eight alter- 

 nate, sessile, narrow spikelcts of about six flowers. Glumes 

 two ranked. Seeds surrounded with hairs. Borders of ponds 

 and rivers. August. Perennial. 



17. SCIRPUS. 



SCIRPUS TRIQUETER. Mich. Triangular club rush. 



Culm leafless, three sided ; spikelets lateral, 

 shorter than the point, sessile, conglomerate, oblong- 

 ovate. Midi. abr. 



A naked, triangular rush, two qr three feet in height. 

 Culm straight, smooth, acute angled and sharp pointed. Spikes 

 lew, in a lateral bunch near the top, mostly sessile, crowded, 

 'eddish. Glumes carinate pointed, with a dilated, lacerated 

 margin. Salt marshes. July, August. Perennial. 



In this variety, the spikes are few in number, mostly sessile, 

 and generally two inches or more below the top of the stem. It 

 corresponds with the figure of Plukenet, but hardly with that of 

 Sowerby. 



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