GRASSES OF IOWA. 181 



DISTRIBUTION. 



Iowa. Manly (Williams) ; Armstrong (Cratty) ; Humboldt, 

 1286 (Pammel) ; Emmet County, 1929, 1920 (Ledyard), 3223 (Grid- 

 ley), 3266 and 3263 (Armstrong) ; Elmore, Minn. (Iowa and Minne- 

 sota line), 915 (Pammel) ; Lyon County (E. D. Ball). 



North America. Damp, sandy soil, New York (Lake George, 

 Vasey), New Jersey, westward to Minnesota (DeSoto Lake, Sandberg), 

 South Dakota, Colorado (Veta Pass, Vasey), and Wyoming (Clear 

 Creek, Griffith and Williams). 



13. CALAMOVILFA. 



Calamovilfa Scribner in Hack. True Grasses. 113. 1890. Scribner. 

 Bull. U. S. Dept. Agrl. Div. Agros. 20: 84./. 62. (Rev. ed.) 



Ammophila Host. Gram. Aust. 4: 24. pi. 41. 1809. Endlicher. Gen. 

 PI. 90. Bentham and Hooker. Gen. PI. 3: 1153. 



Psamma Beauv. Agros. 143. 1812. 



Calamagrostis sec. Calamovilfa A. Gray. Man. Bot. Northern U. S. 

 616 (5 ed.) 



Rudiment of second flower wanting; glumes and palet rather char- 

 taceous, compressed-keeled; flowering glume 1 -nerved, entirely awnless; 

 palet strongly 2-keeled ; panicle at length open and loose. 



There are three living species. Native to the temperate and sub- 

 tropical regions of North America. The related sea-sand reed, Ammo- 

 phila, is distinct. There are two species of Ammophila widely distrib- 

 uted among the salt water shores of the northern hemisphere. Valuable 

 as a sand binder. 



