(iKASSES OF IOWA. 87 



three-nerved, second nearly half the length of the spikelct, five-nerved; 

 the third five-nerved and as long as the transversely rugose, flowering 

 glume. Fields and waste places about dwellings. June to September. 



Pigeon grass is abundant in all parts of the state, introduced by 

 the earliest settlers. A pernicious weed in all cultivated fields. 



DISTRIBUTION. 



Iowa. High Bridge (Lummis) ; State Center (Pamrnel) ; Post- 

 ville 3347, 3006, 3151 Lansing, 3164 Steamboat Rock, 3058 Pilot 

 Mound (Miss King); Jackson County, Keokuk (Shimek) ; Calhoun 

 County (Rigg) ; 3047 and 3283 Steamboat Rock, Eagle Grove, Car- 

 roll, Dakota City, 883 Slater, Jefferson, Marsh all town, Clinton, Car- 

 narvon, 14.50 De Witt (Pammel); Gilbert, Jewell Junction, Indian- 

 ola (Carver); Ames (Zmunt, Fairfield, 910 Wadleigh, Hitchcock, 

 Ketterer, 180 Ball, Sirrine, Pammel, Bessey) ; 3346 Marathon (Rob- 

 erts) ; 957 Battle Creek (Preston) ; 647 Mt. Ayr (Beard) ; LeClaire 

 (F. M. Rolfs) ; 740 Dixon (Snyder) ; Dysart (Miss Sirrine) ; Sioux 

 City (Miss Wakefield) ; Taylor County (Pool) ; Keokuk, Lawler (P. 

 H. Rolfs) ; Marshalltown (Stewart) ; Mt. Pleasant (Witte) ; Fay- 

 ette (Fink) ; 743, Emmet County (Pammel and Cratty) ; Muscatine 

 (Reppert) ; Belmond (Clark) ; Manly (Williams) ; West Union 

 (Whitmore) ; 832 Belknap (Rankin) ; Anderson, Charles City, 848 

 Libertyville (Baldwin); Marshalltown (Eckles); Red Oak (Holt); 

 Keokuk (Shimek); Council Bluffs (Misses Cavanagh and Dilne) ; 

 Johnson County (Hitchcock and Macbride) ; Algona (Watson). 



North Ajnerica. Maine, Connecticut, New York to Florida; 

 Alabama, Texas (Navasota, Blackshear), Louisiana (Ball), Arkansas 

 (Rolfs), Mexico, Colorado (Petersburg, Pammel, Johnson, Lum- 

 mis and Buchanan), (La Porte, Pammel and Johnson), Iowa, Minne- 

 sota, Missouri (St. Louis, Pammel), Nebraska (Crete, Pammel, 207), 

 the Dakotas, Wisconsin ( LaCrosse, C. M. King) ; New Brunswick to 

 Saskatchewan. 



General. From British Islands, Germany, France and east to 

 Asia and Australia. 



3. SETARIA VIRIDIS. ' 



Setaria viridis. Beauv. Agros. 51. 1812. Watson and Coulter in Gray's 

 Man. Bot. 634. (6 ed.) Lamson-Scribner, Grasses of Tenn. Bull. Univ. of 

 Tenn. Agrl. Exp. Sta. 7: 56. pi. 16. /. 63. 1894. 



Panicum viride L. Sp. PI. 83. 1762. (2 ed.) 



Ixophorus viridis Nash, in 111. Fl. 1: 126. /. 282. 1896. 



Chamatraphis viridis L. Porter. Bull. Torr. Club. 20: 196. 1893. Beal. 

 Grasses of N. A. 2: 157. 1896. 



Chaetochloa viridis Scribu. Bull. U. S. Dept. Agrl. Div. Agros. 4: 39. 

 1897—7: 71. /. 65. 1900. 



