266 GRASSES OF IOWA. 



three-nerved, flowering glumes ovate, scarious toward the apex, five- 

 nerved, the nerves silky-hairy below, and with a small tuft of cobwebby 

 hairs at the base. May to July. 



Blue grass occurs in all parts of Iowa, but probably only a> an in- 

 troduced plant. The earliest settlers brought the seed with them. The 

 species takes kindly to all kinds of soil except the very low grounds. It 

 is commonly found in woods, and is now displacing the wild prairie 

 grasses in unbroken sod. Poa pratensis is the most valuable pasture g 

 in Iowa. It runs into many varieties. 



DISTRIBUTION. 



Iowa. Steamboat Rock, Pine Creek (Miss King); 3214 Mason 

 City, 3215 Calmar Junction, 2260 Des Moines, 661 Missouri Valley, 

 1508 Wall Lake, 2143 Bloomfield, Sioux City, 1025 Story City, Logan, 

 Jefferson, Carroll, Council Bluffs, 661 Missouri Valley, 2124 

 Wall Lake Pammel) ; 3162 Lansing, 3195 Steamboat Rock 

 (Miss King); 633 Parkersburg (Stout); Corwith (Pierson) ; 3297 

 Red Oak (Miller); 1142 Durant (Weaver); 1121 Alden (Stevens); 

 2258 Mt. Pleasant (Mills) ; Morning Sun (Carver) ; 2075 and 2076 

 Clermont (Walker) ; Ames (Stewart, P. H. Rolfs, Fred Rolfs, Sirrine, 

 1 158 Pammel, Beardslee, Fisher, Weaver, Crozier) ; 2057 Mt. 

 Pleasant (Mills); Mt. Zion (Moore); Sioux City (Miss Wake- 

 held); 1069 Emmet County (Cratty) ; Marshalltown (Eckles) ; 

 Fayette (Fink); Wheatland (Ball); Dysart (Miss Sirrine); Monti- 

 cello (Bessey) ; Johnson Count}', High Bridge, Dallas County- 

 ( Shimek) ; Iowa City ( Macbride, Preston) ; Emmet County (Cratty) ; 

 Calhoun County (Rigg) ; Wall Lake (Pammel) ; Mahaska County 

 (White) ; Ft. Dodge (Olson). 



North America. Fields and meadows throughout the United 

 States and British America; Massachusetts (Cambridge, Pammel), 

 Illinois (Fast St. Louis, Eggert), Missouri (St. Louis, Pammel), South 

 Dakota (Brookings. Williams 2227), Nebraska (Hastings 116 and 

 94, McCook 393, Oxford, Grand Island 69, Pammel), Colorado 

 I Larimer County, Colorado Springs 290 and 264, Stove Prairie Hill, 

 Ft. Collins, Beaver Creek, La Porte, Cache La Poudre River, Pammel), 

 Wyoming (Albany County, A. Nelson; Sherman 244, Pammel: Sheridan 

 County, Pammel and Stanton; Black's Fork, Pammel, Buchanan, John- 

 son and Lummis, <)22 and 1681). Utah (Ft. Douglas, Pammel, John- 



