20 CLASS III. ORDER III. 



sembling a small panicle. — Wet grounds and salt marshes. — 

 September. 



CvPERus DENTATUS. Tormj. Tootkcd Cypcrus. 



Umbel compound, six to ten rayed, shorter than the 

 invohicre ; spikelets three together, ovate compressed, 

 eight flowered. 

 Syn. Cypekus parviflorus. Miihl. 



Ten or twelve inches high. Spikes very much compressed, 

 the tips of the glumes spreading so as to give a serrate appear- 

 ance to the edge as remarked by Dr. Torrey. — Edges of water. — 

 September. 



Cyperus strigosus. L. Narrow spiked Cyperus. 



Spikelets hnear, spreading or reflexed, ten or 

 twelve flowered ; root globose. 



A foot or more in height. Umbel mostly simple, the spike- 

 lets numerous, narrow, and inserted into their common stalk 

 nearly at right angles. — Low grounds. — August, September. — 

 Perennial. 



Cyperus mariscoides. Ell. Tuberous Cyperus. 



Umbel simple with one or two rays ; spikelets 

 seven or eight flowered, collected into dense spherical 

 heads ; root globose. 



Eight or ten inches high. Root a solid bulb. Spikelets 

 crowded into hard, dense heads. — Plentiful on the barren sand in 

 the lower part of VVatertown. — July, August. — Perennial. 



^ Subgenus Dulichium. Spikelets racemed, style bijid. 



Cyperus spathaceus. L. Sheathed Cyperus. 



Culm round, leafy ; leaves alternate, Avith entire 

 sheaths : racemes axillary and terminal. 



Syn. SciRPUs spathaceus. Mich. 



Dulichium sfathaceum. Rcichard. 

 A tall, leafy grass. Stem smooth, hardly three sided, covered 

 with numerous short, flat, smooth, spreading leaves, proceeding 



