GRASSES OF IOWA. 



117 



DESCRIPTION. 



Tufted Triple Awn Grass. An erect, slender, smooth, much- 

 branched perennial, 5 to 20 inches (1-4 dm.) high, with narrow, involute- 

 setaceous leaves, and few-flowered, spike-like panicles, 2 to 3 inches (.5- 

 .75 dm.) long. Empty glumes unequalt middle awn 6 to 9 lines (12- 

 18 mm.) long, coiled at base and divergent. Common on gravelly 

 knolls in northern, central and eastern Iowa. August to September. 



Fig. 83. Aristida basiramea—a, empty 

 glumes; b, flowering glume. (Div. Agros. U. 

 S. Dept. Agrl. ) 



DISTRIBUTION'. 



Iowa. Muscatine (Reppert): Muscatine, 1238 (Pammel and 

 Reppert) ; Ames, 174 (Hitchcock, Pammel); Iowa City (Hitchcock, 



