GRASSES OF IOWA. 



215 



the Long, tough leaves arc employed in the manufacture of paper, and a 

 decoction of the stunt rhizomes is valued as a diuretic. 



Fig. 151. Oynerium argenteum — a, empty glumes of & pistillate spikelet ; b, pistillate 

 spikelet, the empty glumes removed; c, empty glumes of a staminate spikelet, empty 

 glumes removed. (Div. Agros. U. S. Dept. Agrl. ) 



2. PHRAGMITES. 



Phragmites. Trin. Fund. Agrost. 134. 1820. (in part.) Endlicher 

 Gen. PI. 91. Bentham & Hooker Gen. PI. 3: 1179. Hackel in Engler & 

 Prantl. Nat Pflanz. Fam. II. 2: 68. Scribner. Bull. U. S. Dept. Agr. 

 Div. Agros. 20: 126. /. 95. [Rev. Ed.] 



Arundo Beauv. Agrost. 60. pi. 13. f. 2. 1812. 



Czernya Presl. Cyp. & Gram. 22: 1820. 



Spikelets 3 to 7-flowered ; the flowers rather distant, silky villous 

 at base, and with a conspicuous, silky-bearded rachis, all perfect and 3- 



