GRASSES OF IOWA. 271 



drooping. Spikelets i to 2 lines (2-4 cm.) long, three to seven-flowered, 

 obtuse; empty glumes, rather broadly ovate, less than \ line (1 mm.) 

 long; flowering glumes truncate-obtuse, | to 1 line ( l| to 2 mm.) long. 

 and strongly seven-nerved. Paleas two-toothed. Very variable in size. 

 Wcr meadows, marshes, moist thickets etc. June to September. See 

 figure 188, on page 209. 



Nerved manna grass is common throughout the state in low 

 meadows, but most abundant in the northern sections. It occurs in con- 

 siderable abundance in southwestern Iowa, in Fremont and Page 

 counties. It has little agricultural value. 



DISTRIBUTION. 



Iotua. Nodaway River (Stewart) ; Ames (Hitchcock, 5 Ball and 

 Sample, Bessey, 6 and 7 Beardslee, Crozier, 175 Ball, P. H. Rolfs, 

 Stewart. C. A. Wilson, Pammel, 14 Ball) ; 6 Elmore, Minn., Minne- 

 sota-Iowa line, 1 3 10 Council Bluffs, 3363 and 3364 Spirit Lake, 2255 

 Des Moines (Pammel) ; Jewell Junction (Carver) ; Mt. Pleasant 867 

 (Mills) ; Tama County (Sirrine) ; Iowa City (Hitchcock) ; Johnson 

 County (Shimek) ; Armstrong (Cratty) ; Story City 777 and 1024 

 (Pammel and Beyer) ; Decatur County (Fitzpatrick) ; Sioux City (Miss 

 Wakefield) ; Birmingham 940 (Pammel) ; High Bridge, Dallas County 

 (Shimek) ; Hamilton to Hancock County (Preston) ; Ogden (Pam- 

 mel) ; Ft. Dodge (Oleson). 



North America. Wet meadows, marshes, moist thickets, etc., New- 

 foundland, New York (Parry), Massachusetts (Pammel), south to 

 Florida, Wisconsin (La Crosse, Pammel), Illinois (Redbud, Pammel), 

 Minnesota (Itaska Lake, Sandberg), Nebraska (Savage, Reefe), Mis- 

 souri (St. Louis, Forest Park, Eggert; Washington, Pammel; 8979 

 Nelson), Colorado (Larimer County, Crandall), Wyoming (Sheridan, 

 Pammel; Black's Fork, Pammel, Johnson, Buchanan and Lummis; 

 New Castle and Sherman, Pammel), Idaho (Sandberg, Heller and 

 McDougal), Utah (Parry and Palmer). 



General. Introduced in France. 



2. GLYCERIA AMERICANA. 



Glyceria Americana Pammel kuz'. comh. 



Poa aquatica var. Americana Torr. PI. U. S. 1: 408. 1824. 



Glyceria grandis S. Wats. A. Gray. Man. Bot. 667. 1890. (6 ed.) 



Glyceria aquatica Smith. Scribner. Grasses of Term. Bull. Univ. Tenn. 

 Agrl. Exp. Sta. 7: 112. /. 152. 1894. 



Panicularia Americana (Torr.) MacM. Met. Minn. Val. 81. 1892. 

 Beal. Grasses of N. A. 2: 568. /. 114. 1896. Nash in Britton and Brown. 111. 

 Fl. 1: 212. /. 489. 1896. Scribner. Bull. U. S. Dept. Agr. Div. Agros. 7: 

 286. /. 280. 1900. (3-ed.) 



