GRASSES OF IOWA. 257 



DISTRIBI l ION. 



Iowa. Baxter (Williamson); S75, 856 and 1172, Mt. Pleasant 

 (Mills) ; Armstrong (Cram); [138, Durant (Weaver) ; Ames (Sir- 

 rine, Hitchcock, 152, Ball, E. R. Wilson, Rich and Gossard, C. A. 

 Wilson, Bessey, Fisher, Crozier, Carver, Stewart); Sionx City, Clin- 

 ton, Des Moines, Dakota City, 319] Moulton, 1927 New Albin, 

 Webster City, 1454 De Witt, 1427 Carroll, 906 Elmore, .Minn., Iowa- 

 Minnesota line, Jefferson, Marshalltown, Russell, Cedar Rapids, 780 

 Marshalltown, 1244 Council Bluffs (Pammel) ; Gilbert, Jewell Junc- 

 tion, Boone to Winterset (Carver) ; Chariton (Bennett) ; Lebanon 

 (Sample) ; Mt. Zion (Moore) ; 22 Lebanon (Ball and Sample) ; 3276 

 Ontario (Faurot) ; Chariton 676 (Mallory) ; 826 Belknap (Rankin) ; 

 Marshalltown (Eckles) ; Muscatine (Reppert) ; Tipton, Iowa Cii\ 

 (Hitchcock); Keystone (Koch); Keokuk and Lee County (Shimek); 

 Hamilton to Hancock County (Preston), Onslow (Cameron); Han- 

 cock Count}-, Unionville (Shimek); Decatur County (Shimek). 



North America. Dry meadows and waste places, Newfoundland 

 to New York (Parry), to South Carolina, Tennessee and westward; 

 Illinois (Ogle Count)', Edwards), Missouri (St. Louis, Eggert; Web- 

 ster, Pammel), Nebraska (northeastern Nebraska, Clements, 2643; 

 Grand Island, 115; McCook, 397, 403. Crete, 205, Pammel), North 

 Dakota (Richburg, Condit), California (Mt. Shasta, Palmer, 2654). 



General. Great Britain, middle and southern Europe, Siberia, 

 Kamchatka. 



4. POA DEBILIS. 



Poa debilis Torr. Fl. N. Y. 2: 459. 1843. Watson and Coulter. Gray. 

 Man. Bot. 665. 1890. (6th ed.) Beal. Grasses ofN. Am. 2. 539.1896. 

 Nash in Britton and Brown. 111. Fl. 1: 206. f. 472. 1896. Scribner 

 Bull. U S. Dept. Agr. Div. Agros. 17: 239. /. 535. 1899. 



DESCRIPTION. 



Weak Spear Grass. A slender, erect, smooth perennial, 1 .', to 2 

 feet (3-7 dm.) high, with rather short, Hat leaves, and nodding, few- 

 rlowered, open panicles, 2 to b inches (4-12 cm.) long, spikelcts u to 2 

 lines (3-4 mm.) long, two to four-flowered, with unequal, acute 

 empty glumes, broadly obtuse and scarious-tipped flowering glumes 

 conspicuously webbed at the base. In rocky woodlands. May to Julv. 



Poa debilis has been found at one locality only in Muscatine 

 County, Iowa. See figure 179, on page 2^8. 



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