18 Class III. Order III. 



18. CYPERUS. 



CYPERUS INFLEXUS. Muhi. Inflected Cyperus, 



Heads roundish, glomerate ; spikelets linear, about 

 eight flowered ; glumes squarrose at the tip. 



Syn. CTPERUS UNCINATUS. Pursk. 



Two or three inches high, with soft, crowded, ascending-, slen- 

 der spikelets ; the glumes recurved at the tip. Wet grounds. 



August. 



CYPERUS FLAVESCENS. L. Yelloiv Cypcrus. 



Spikelets linear-lanceolate, crowded, three or four 



together ; involucre three leaved, longer than the 



umbel. 



Spikelets from fifteen to twenty flowered, yellowish green. 

 Wet grounds. August, September. Perennial. 



CYPERUS CASTANEUS. Chesnut Cyperus. 



Spikelets ovate-lanceolate, involucre three leaved, 

 longer than the umbel. 



Syn. CTPERUS FLAVESCENS, /3. CASTANEUS. Pursh. 



Smaller than the preceding ; spikelets broader, chesnut colour- 

 ed, fifteen to twenty flowered. Wet grounds. August. 



CYPERUS DIANDRUS. Torrey. Diandrous Cyperus. 



Umbel sessile, or one to two rayed, shorter than the 

 involucre ; spikelets oblong-lanceolate, about fifteen 

 flowered ; stamens two. 



From eight to twelve inches high, the umbel sometimes re- 

 sembling a small panicle. Wet grounds and salt marshes. Sep- 

 tember. 



CYPERUS DENTATUS. Torrey. Toothed Cyperus. 



Umbel compound, six to ten rayed, shorter than the 

 involucre ; spikelets three together, ovate compress- 

 ed, eight flowered. 

 Syn. CTPERUS PARVIFLOKUS. MM. 



Tea or twelves inches high. Spikes very much compressed, 



