348 



Bulletin' No. 2().") 



[March, 



glumes, loiuma, and palca are all of the same texture. The glumes arc 

 flattened and keeled, with a row of stout hairs along the keel. The 

 blades are short and narrow ; the ligule is composed of a ring of short 

 hairs. 



146 



149 



148 



160 



147 



Figs. 14(5-150. — 146, B. erecUim, inflorescence; 147, B. erechi/m, spikelet; 

 148, H. schocnoidcs, inflorescence; 149, R. scJioc^ioidcs, spikelet; 150, P. pratense, 

 spikelet 



Heleochloa schoenoides (L.) Host 

 Rush Cat-tail Grass (Figs. 148 and 149) 



Culms smooth, 4 to 18 inches tall, sheaths much shorter than the 

 internodes, the upper sheaths enlarged ; blades 1 to 3 inches long, 

 sharp-pointed, rather rough on the upper surface; panicle 1 to 1.5 

 inches long; spikelets about 2.5 mm. long. 



This grass has not been reported from many localities in Illinois. 

 It is found in waste places. 



COOK CO. Blue Island, Eobert Behb, Aug., 1902 and 1903; Chicago, Somes, 

 Aug., 1909. ST. CLAIR CO. East St. Louis, Eggert, Aug., 1893. 



24. PHLEUM L. 

 Cat-tail Grass 



The native species of this genus (P. alpinnm) does not occur in 

 Illinois, being found only on high mountains or in the arctic regions 



