352 GRASSES OF IOWA. 



DISTRIBUTION'. 



Iowa. Ft. Dodge (Oleson) ; Mason City (Pammel) ; Steamboat 

 Rock 3050 (Miss King) ; Pilot Mound 3048 (Miss King and Mac- 

 Corkindale) ; Wilsonville (Taylor) ; Wheatland (Ball) ; Harcourt 

 (Danielson) ; Keokuk (P. H. Rolfs) ; Kossuth County 804 (Pammel 

 and Cratty) ; Hancock County 9 (Shimek) ; Greene (Miss Price) ; 

 Hawarden, Cedar Rapids, South Dakota opposite Hawarden, Marshall- 

 town 1079, Dakota City, 901 New Albin, 1280 Council Bluffs (Pam- 

 mel) ; Keystone (Koch) ; Hancock County 6 (near Forest City, 

 Shimek); 707 Forest City, Ames (Carver); Ames 1 145 (Louthan, 

 Rich and Gossard, E. R. Wilson, Carver) ; Grinnell (Jones) ; Granite, 

 Sioux City (Shimek) ; Steamboat Rock (Shimek). 



North America. On river banks, Nova Scotia to Alberta, south to 

 New York (Washington County, Parry), Wisconsin (Bloomingdale, 

 C. M. King), Minnesota (Sandy Lake, Sandberg 770), South Dakota 

 (Forest City, Griffith), Georgia, Texas and New Meixco; Colorado 

 (Ft. Collins, Crandall; Colorado Springs and Ft. Collins 265, 344, 

 Pammel; Petersburg, Pammel, Johnson, Buchanan and Lummis), Utah 

 (Duchesne River, Pammel and Stanton, 8500 ft.), Washington (Alma, 

 Elmer, 518). 



10. ELYMUS ROBUSTUS. 



Elymus robustus Scribn. and Smith. Bull. U. S. Dept. Agrl. Div. 

 Agros. 4: 37. 1897. Bull. U. S. Dept. Agrl. Div. Agros. 17: 317. /. 613. 

 1899. 



DESCRIPTION. 



Robust Lyme Grass. A stout, leafy perennial. 4 to 8 feet (9-18 

 dm.) high, with thick, terminal, long-bearded spikes, 5 to 7 inches (10- 

 14 cm.) long. Spikelets three to four-flowered, with linear, subulate 

 empty glumes and scabrous or pubescent flowering glumes. Awns 

 spreading, 1 \ to 2 inches (3-4 cm.) long. July to September. See figure 

 251, on page 351. 



Elymus robustus is a segregate from E. Canadensis, and is our most 

 common form. Lyme grass occurs along railroads, on the prairie and 

 in the flood plains of our streams. Found in all parts "of the state. 



DISTRIBUTION. 



Iowa. Oskaloosa (White) ; Ft. Dodge (Oleson) ; Muscatine 12 

 (Ball); Pilot Mound 3045 (Miss King and MacCorkindale) ; Red 



