GRASSES OF IOWA. 



113 



DISTRIBUTION. 



Iowa. Charles City (Arthur) ; Marshalltown, 17 (Ball and 

 Combs) ; Armstrong, 1075, Emmet County (Cratty) ; Ames (Beards- 

 lee) ; Jewell junction, 1169 (Stewart) ; Eagle Grove, 1170 (Stewart) ; 

 Little Rock (Miss Bowen). 



\orth America. From New England to New York, Massachu- 

 setts (Cambridge, Pammel), New Hampshire (Mt. Washington, Flint 

 and Huntington) ; west to Illinois, Michigan, Wisconsin (Madison, 

 Pammel), Ohio (Columbus, Sullivant), Colorado (La Poudre River, 

 8500 ft., Pammel), Utah (Provo River, Pammel and Stanton), Mon- 

 tana, Wyoming (Clear Creek, Griffith; Sheridan County, Dome 

 Lake Pammel, 83; Rapid Creek Park, Pammel, 82), Alaska; from 

 New Foundland, Labrador to New Brunswick, Quebec and 'Ontario. 

 Manitoba north to Pease River, and Columbus Valley to 62 degrees 

 north latitude. 



General.. Great Britain, Arctic and Alpine northern Europe, 

 northern and western Asia. 



TRIBE VIII. AGROSTIDEAE. 



Spikelets all hermaphrodite, 1 -flowered with three glumes, the first 

 two empty (very rarely wanting), usually as long as or exceeding the 

 third or floral glume ; rachilla sometimes prolonged behind the palea into 

 a naked or plumose bristle. Palea two-nerved 

 (one-nerved in Cinna), nerveless, or (in some 

 Agrostis species) wanting. 



The tribe Agrostideae is an important one, 

 numbering about 700 species, arranged in 46 

 genera. They occur throughout the temperate 

 and w T armer regions of the world, some occur- 

 ing within the tropics. The genus Agrosti:> 

 (Red Top), and the genus Phleum (Tim- 

 othy), are the best known representatives of f^- Bvikeletot Agrostis 



' alba, sterile lower glumes, 



the tribe. Some members of the genus are in- flowering glume, palet, 



stamens and stigmas, 

 jurious tO live Stock, like Aristida and Stipa. (Adapted from Gray's Man.) 



KEY TO THE GENERA OP THE AGROSTIDEAE. 

 Flowering glume indurated at maturity, firmer in texture than the empty 

 glumes, very closely enveloping the graiD, awn, when present, terminal. 

 Rachilla not prolonged behind the palea. 



Flowering glume with a trifid awn Aristida.^ 



Flowering glume with a simple awn. 

 Flowering glume narrow. 



