16S GRASSES OF IOWA. 



North America. In damp woods from New Jersey south to North 

 Carolina and Tennessee, through Wisconsin, Minnesota (St. Cloud, 

 Campbell ; Grand Rapids, Sandberg) ; in the Rocky Mountains of 

 Colorado, Utah, Idaho (Kootenai, Sandberg, Heller and McDougall), 

 Washington (Okanogan County, Elmer; Leiberg and Sandberg) ; New- 

 foundland (John's Beach, A. Waghorn), Canada (Hastings County, 

 Macoun). 



11. AGROSTIS. 



Agrostis L. Sp. PI. 6. 1753. Endlicher. Gen. PI. 89. Bentham and Hooker. 

 Gen. PI. 3: 1149. Hackel in Engler and Prantl. Nat. Pflanz. Fam. II. 2: 

 50. Scribner. Bull. U. S. Dept. Agrl. Div. Agros. 20: 80. /. 58. 



Trichodium Michx. Fl. Bor. Am. 1: 41. 1803. 



Agraulus Beauv. Agros. 5. 1812. 



Chamaeca lamus Meyen. PI. Reise. 1: 456. 1835. 



Didymochaeta Steud. Syn. PI. Glum. 1: 456. 1835. 



Spikelets I -flowered, in an open panicle. Empty glumes somewhat 

 equal, or the lower rather longer, usually longer than the flowering 

 rlume, pointless. Flowering glume and palet very thin, pointless, naked 

 the first 3 to 5-nerved, frequently awned on the back; the palet often 

 minute or none. Stamens chiefly 3. Grain (caryopsis) free. Culms 

 usually tufted, slender; root commonly perennial. (Name from Greek, 

 for a field, the place of growth.) 



One hundred species, mostly cosmopolitan, occurring especially in 

 north temperate regions; Europe 38; Russia 20; North America 33; 

 of which 15 are accredited to Canada; California 14 to 18; eastern 

 states 6 to 8 ; Rocky Mountains 6 to 8. 



KEY TO THE SPECIES OF AGROSTIS. 



Palet conspicuous, at least \ as long as flowering glume A alba. ' 



Palet inconspicuous, minute or wanting. 



Culms weak, usually decumbent at base, leaves lax, spikelets H mm. 



long . .A . perennans. 2 



Culms and leaves erect. 



Panicle branches capillary , elongated, spikelets crowded at ends.. 



— A. scabrar 

 Panicle branches not elongated A. intermedia . 4 



1. AGROSTIS ALBA. 



Agrostis alba L. Sp. PI. 63. 1753. Watson and Coulter in Gray. Man. 

 Bot. 647. 1890. (6th ed ) Scribner Grasses of Tenn. Bull. Univ. Tenn. Agrl. 

 Exp. Sta. 7: 78./. 102. 1894. Beal. Grasses of N. A. 2: 332. 1896. Bull. 

 U. S. Dept. Agrl. Div. Agros. 17: 187. /. 483. 1899. Vasey. Contr. U. S. 

 Nat. Herb. 3: 77. 



