214 



5 -nerved, blunt, mucronulate, somewhat appressed ; stem 2 to 3 

 feet high, obtusely triangular, tumid at the base ; leaves as long 

 as the stem, broadly linear, very rough on the edges ; achenium 

 small, triquetous. Marshes and borders of lakes in the Red 

 River Valley, Repides, La., (Hale); eastern Florida (Leaven- 

 worth); Carrabelle, Florida. 



(D) Sub-genus DiCLlDlUM, Nees. 



54. C. specios2is,N-3X\\\ Torrey in part. (C Michajixianiis, 

 Torrey, not of Schultes.) New England to Wisconsin, and 

 southward to Florida (Curtiss, N. A Plants, No. 3048) and 

 Texas (C. Wright, 1849, No. 706); also in California. 



Var. SQUARROSUS, n. var. {C.ferriiginescens, Boeckl.) Scales 

 spreading or recurved, reddish. New Mexico (Fendler, No. 

 870); St. Louis, Mo., (Engelmann) ; Texas (Buckley.) 



Var. PARVUS, n. var. {C. parvus, Boeckl.) Low, i to 3 

 inches high ; umbel very simple, generally of a single cluster of 

 short terete spikelets. Cited by Boeckeler as collected by Dr. 

 Engelmann at St. Louis, and Drummond's Collection, No. 34 ; 

 No. 1946, C. Wright, New Mexico, answers Boeckeler's descrip- 

 tion. 



55. C. fcrax, Richard. {C. flexiiostis, Vahl ; C. pennatus, 

 Boeckl, not Lam.) Missouri (F. Bush); Texas (Bigelow, Buckley); 

 Arizona (Pringle) ; California (Parish, 1064); West Indies and 

 widely distributed in tropical regions. For synonomy see Clarke, 

 Journ. Linn. Soc, xx , p. 295. 



56. C. Engelmannii, Steud. Massachusetts (Morong) to 

 Wisconsin and southward, but not often collected. 



57. C. oxycarioides, Bntton,in Bull. Torr. Bot. Club, xi., p. 

 86. Valley of the lower Rio Grande (Buckley.) 



(E) Sub-genus Mariscus, Vahl. 

 * Umbel simple or capitate. 



t Spikelets few (2 to 6), flowered. 



58. C. ovnlaris, Torrey. Southern New York to Illinois 

 and southward ; westward to Arkansas and Texas. 



Var. robustus, Boeckl. Heads larger, 6 to 8 lines in diameter, 

 on longer rays; spikelets 3 to 6-flowered. {C. VVolJii, Wood, in 

 Bull. Torr. Bot. Club, vi., p. 72.) Illinois (Bcbb ; J. Wolfj ; 



