30 GRAMINEAE 



1. AiraoaryophyHeaL. Silvery Hair GRASS. (Man.p. 115 ; I-F- 

 /.SSs-) In fields and waste places, Mass. to Va. Also on the Pacific 

 Coast. Nat. from Uu.— Pennsylvania : Philadelphia, about ballast. 



2. AlrapraecoxL. Early Hair-grass. (Man. p. 116 ; I. F./ j5<5.) 

 In dry fields, southern N. J. and Pa. to Va. Nat. from n\i.— Pennsyl- 

 vania : Northampton, Bethlehem. 



35. DESCHAMFSIA Beauv. 



Flowering scales about 2.5 mm. long, erose-truncate : leaf-blades flat. 



1. D. caespitosa. 

 Flowering scales about 4 mm. long, acute or obtuse : leaf-blades involute. 



2. D.flexuosa. 



1. Deschampsia caespitosa (L. ) Beauv. Tufted Hair-Grass. (Man. 

 p. 116 ; I. F./ 387.) Newfoundland to Alaska, N. J., 111., Minn., and in 

 the Rocky Mts. and Sierra Nevada to N. Mex., mostly in wet soil. Also 

 in Eu. and Asia..— Pennsylvania : Chester; Lancaster; Monroe; 

 Bucks. 



2. Deschampsia flezuosa (L,.) Trin. Wavy Hair-grass. (Man. p, 

 116 ; I. F./. 388.) In dry or sandy soil, Greenland and Newf. to Mich., 

 N. C. and Tenn. Also in Eu. — Pennsylvania : Lackawanna ; North- 

 ampton ; Lancaster ; Franklin ; Monroe ; Pike. 



36. TRISBTUM Pers. 

 1. Tiisetum Fennsylvanicum (L.) Beauv. Marsh False Oat. 

 (Man. p. 117 ; I. F._/. 392.) In swamps and wet meadows, N. Y. to 111., 

 Fla. and La. — Pennsylvania : Delaware ; Chester ; Bucks ; North- 

 ampton; Lancaster; Dauphin; Lycoming. 



37. AVENA L. 



1. Avena striata Michx. PurplE OaT. (Man.p. 118; I. F./.jpj.) 

 In woods, N. B. to B. C, Pa., Mich, and Dak. — Pennsylvania: Sulli- 

 van ; Elk. 



38. ARRHENATHERUM Beauv. 



1. Arrhenatherum elatins(L.) Beauv. OaT-grass. (Man. p. 118 ; I. 

 F. /■ 396.) In fields and waste places, Me. and Ont. to Ga. and Tenn. 

 Also on the Pacific Coast. Nat. from Eu. — Pennsylvania : Chester : 

 Lancaster ; Northampton. 



39. DANTHONIA DC 



Empty scales of the spikelet 1.25 cm. long or less : leaf -sheaths glabrous, or 

 sometimes sparingly pubescent at the base. 

 Teeth of the flowering scale about i mm. long, acute : cauline leaf-blades 



short : panicle contracted. i. D. spicata. 



Teeth of the flowering scale 2-3 mm. long, awned ; cauline leaf-blades elon- 

 gated : panicle usually open. 2. D. compressa. 

 Empty scales more than 1.25 cm. long ; leaf-sheaths villous. 3. D. sericea. 



1. Danthonia spicata (L.) Beauv. Common Wild Oat-grass. (Man. 

 p. 119; I. F. /. 397.) In dry soil, Newf to N. Dak., N. C. and La.— 



