372 PLANT LIFE OF ALABAMA. 



DESCHAMPSIA I'.c.iiiv. AKfosl. 91. 1812. 



Pi>reiini:»l. Ahoiii I'd spicics, Iciiiiieiato rtigions of tht- gloln-. Nortli Aiiiorica, 8 

 epeeios. 

 Descbampsia flexuosa (L.) Trin. Kull. Acini. Sci. St. J'otiMsl). 1 : <U). \H'M. 



Common ILmk (Jua.s.s. 



Aim flexuund L. Sp. I'l. 1 : ti.'>. ITiiS. 



Ell.Sk. Irl.'.l. Gray, Mail. .••1.6,652. Chap. Fl. r.6S. 



KUKOl'K. 



Allegluuiiaii an-a. .New Kiif^laiul, New York; south aloii;,' the hij;lu'r Allefiliciiiaii 

 ranges to Georgia, East Tennessee, and Missouri. 



Ai.vbama: Mountain region. Dry rocky dells. J)ekall> County, Lookout Moun- 

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



Type locality : " Hah. in Europae petris, nipihus."' 



Herb. Geol. Surv. Herb. Mohr. 



TRISETUM Pers. Syn. 1 : TT. 1805. 



About 50 species, cooler temperate regions north and south lieniisjilnrei. North 

 America, 8. 



Trisetum pennsylvanicum (L.) Beauv. ; lioem. & Schult. Syst. A'eg. 2 : 658. 1817. 



Swamp Oat Gras.s. 



Arena penmttilvanica L. Sp. PI. 1 : 79. 1753. 



Avena paJuxIrls Michx. Fl. Bor. Am. 1 : 72. 1803. 



Trhctum jxtlioitre Torr. Fl. X. A: Mid. V. S. 1 : 126. 1S21. 



Gray, Man. ed. 6, 653. Chaj). Fl. 568. Scribner, Grass. Tenu. 2 : 82, t. 28, f. 100. 



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 : "Ilab. in Pensylvania. Kalm." 



Herb. Geol. Surv. Herb. Mohr. 



AVENA L. Sp. PI. 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's 

 Island. May to June. Annual. 



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



Herb. Geol. Surv. Herb. Mohr. 



ARRHENATHERUM Beauv. Agrost. 55. 1812. 



Six species in Europe. North Africa. West Asia. 



Arrhenatheruni elatius (L.) Beauv. ; Mert. & Koch, Deutsch. Fl. 1 :i546. 1823. 



Tall Oat Grass. 



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



Arrhenallierum arenaccum Beauv. Agrost. 152. 1812. Name only. 



Gray, Man. ed. 6, 652. Chap. Fl. 569. Seribner, Grass. Tenn. 2 : 83, /. 2S,f. 11 1. 



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

 south to Alabama and Mississippi. 



Alabama: Cultivated in the Prairie region, and a frequent escape. Mol)ile, a 

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



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



Economic uses: "N'aluable hay grass. 



Herb, Geol. Surv. Herb. Mohr. 



