GRASSES OF IOWA. 



123 



DISTRIBUTION. 



Ioiua. Keokuk (Hitchcock). 



North Ann run. Southern New England, New York, New Jersey, 

 Pennsylvania to Florida; west to Georgia (Kearney) and Louisiana 

 (Ball); Texas (Blackshear, Pammel), north through Arkansas, Ken- 

 tucky (Kearney), Missouri (Eggert), Iowa. 



8 ARISTIDA TUBERCULOSA. 



Aristida tuberculosa Nutt. Gen. 1: 57. 1818. Wats >n and Coulter. Gray 

 Man. Bet. 641. 1890. (6th ed . ) Beal. Grasses N. A. 2: 196. /. 40. 1896. Nash 

 in Britton and Brown.. Ill PI. 1: 136. f 307. 1896 ^cribner. Bull. U. S. 

 Dept. Agrl. Div. Agros. 7: 94. 

 f. ^.1900. (3d ed.). Vasey Contr. 

 U. S. Nat. Herb. 3: 48. 



DESCRIPTION. 



Long Awned Poverty 

 Grass. A rigid, much- 

 branched perennial, 12 to 18 

 inches ( 3-4A dm.) high, with 

 nearly simple panicles, 4 to 7 

 inches (10-18 cm.) long, 

 branches erect, rather distant, 

 the lower in pairs, one short 

 and few-flowered, the other 

 elongated and many-flowered. 

 Empty glumes nearly equal, 

 12 lines (24 mm.) long, awn- 

 pointed ; flowering glume about 

 10 lines (20 mm.) long, 

 twisted above to the division 

 of the awns, and with a dense- 

 ly barbate, sharp-pointed cal- 

 lus ; awns nearly equal, diver- 

 gent or reflexed, i-J to 2 inches 

 (3-5 cm.) long, distinctly ar- 

 ticulated with the glume. 

 Aueust to October. 



Flo. 89. Aristida tuberculosa— a, spikelet with 

 lower glumes ; b, flowering glume with divergent, 

 long awns. 



DISTRIBUTION. 



Iowa. Muscatine (Reppert). 



