GRASSES OF IOWA. 



119 



This grass is found in northwestern Iowa from Lyon to Dickinson 

 counties. It is rare or local here. 



DISTRIBUTION. 



Iowa. Probably with the variety. 



North America. Minnesota, Iowa, north to Saskatchewan and 

 British Columbia, southwest to Kansas, Texas, Arizona, Colorado (Ft. 

 Collins, Crandall ; La Porte, Golden and Denver, Pammel ) . Wyo- 

 ming (New Cattle, Pammel), Nebraska (Alma, Grand Island, North 

 "°latte, McCook, Pammel). 



4. ARISTIDA LONGISETA VAR. ROBUSTA. 

 Aristida long'seta robusta Merrill. Circ. U. S. Dept. Agrl. Div. Agros. 



DESCRIPTION. 



Large Purple Aristida. A 

 stout, densely tufted form, i-i^ 

 feet (3-4 dm.) high, with robust 

 culms, more rigid inflorescence and 

 usually longer leaves than in the 

 species. Empty glumes as in the 

 species, except that both are 

 prominently cleft at the apex, 

 bearing in the cleit a scabrous 

 awn about 1 line (2 mm.) long; 

 flowering glume nearly smooth or 

 only slightly scabrous. Dry soils 

 July-September. 



DISTRIBUTION. 



Iowa. Plymouth County (Lei- 

 berg), Rock Rapids (C. R. Ball). 



North America. From South 

 Dakota to Kansas and Washing- 

 ton and British Columbia. 



S. ARISTIDA OLIGANTHA. 



Aristida oligantha Miehx. Fl. 

 Bor. Am.- 1: 41. 1803. Watson 

 and Coulter. Gray. Man. Bot. 

 640. 1890. (6th ed.) Scribner," 

 Grasses of Tenn. Bull. Univ. 



Fig >-5. Aristida longiseta var. robusta. 



a, and c sterile o ter glumes;b, flower show- 

 ing the spreading awns. (Charlotte M. 

 King. ) 



