372 PLANT LIFE OF ALABAMA. 



DESCHAMPSIA Beauv. Agrost. 91. 1812. 



Perennial. About 20 species, temperate regions of the globe. North America, 8 

 species. 



Deschampsia flexuosa (L.) Triii. Bull. Acad. Sci. St. Petersb. 1 : 66. 1836. 



COMMON HAIR GRASS. 



Aira flexuosa L. Sp. PI. 1 : 65. 1753. 



Ell. Sk. 1 : 151. Gray, Man. ed. 6, 652. Chap. Fl. 568. 



EUROPE. 



Alleghenian area. New England, New York; south along the higher Allegheniau 

 ranges to Georgia, East Tennessee, and Missouri. 



ALABAMA: Mountain region. Dry rocky dells. Dekalb County, Lookout Moun- 

 tain; about 1,800 feet. May to June; rare. 



Type locality : " Hab. in Europae petris, rupibus." 



Herb. Geol. Surv. Herb. Mohr. 



TRISETUM Pers. Syn. 1 : 7. 1805. 



About 50 species, cooler temperate regions north and south hemispheres North 

 America, 8. 



Trisetum pennsylvanicum (L.) Beauv. ; Roem. & Schult. Syst. Veg. 2 : 658. 1817. 



SWAMP OAT GRASS. 



Avena pennsylvanica L. Sp. PI. 1 : 79. 1753. 



Arena palustris Michx. Fl. Bor. Am. 1 : 72. 1803. 



Trisetum palustre Torr. Fl. N. & Mid. U. S. 1 : 126. 1824. , 



Gray, Man. ed. 6, 653. Chap. Fl. 568. Scribner, Grass. Tenn, 2 : 82, t. 28, f. 109. 



Alleghenian and Carolinian areas. Southern New York, New Jersey, and North 

 Carolina to the mountains of Tennessee and Northern Alabama. 



ALABAMA: Mountain region. Madison County, Gurley's Place, 1,100 feet altitude. 

 June; rare. Perennial. 



Type locality : "Hab. in Pensylvania. Kalm." 



Herb. Geol. Surv. Herb. Mohr. 



AVENA L.Sp. PL 1:79. 1753. OATS. 



About 30 species, of cooler regions. United States, 2 species. 

 Avena fatua L. Sp. PI. 1 : 80. 1753. WILD OATS. 



Gray, Man. ed. 6, 653. Wats. Bot. Calif. 2 : 295. 



EUROPE. 



Introduced, sparingly naturalized in a few localities of the Atlantic States. Abund- 

 ant on the coast of California. Annual. 



ALABAMA: Adventive on ballast and fairly established. Mobile County, Pinto'a 

 Island. May to June. Annual. 



Type locality : "Hab. in Europae agris inter segetes." 



Herb. Geol. Surv. Herb. Mohr. 



ARRHENATHERTTM Beauv. Agrost. 55. 1812. 



Six species in Europe. North Africa. West Asia. 



Arrhenatherum elatius (L.) Beauv. ; Mert. & Koch, Deutach. Fl. 1 : 546. 1823. 



TALL OAT GRASS. 



Avena elatior L. Sp. PI. 1 : 79. 1753. 



Arrhenatherum avenaceum Beauv. Agrost. 152. 1812. Name only. 



Gray, Man. ed. 6, 652. Chap. Fl. 569. Scribner, Grass. Tenn. 2 : 83, t. 28, f. 111. 



Introduced from Europe and naturalized in Ontario and the eastern States, ;md 

 south to Alabama and Mississippi. 



ALABAMA: Cultivated in the Prairie region, and a frequent escape. Mobile, a 

 fugitive on ballast heaps. Hale County, Gallion. Cullman County. Perennial. 



Type locality : " Hab. in Europae maritimis et apricis." 



Economic uses : Valuable hay grass. 



Herb, Geol. Surv. Herb, Mohr. 



