30 GRAMINEAE 



1. Aira caryophyllea L. Sii^very Hair grass. (Man. p. 115 ; I. F. 

 /• 3^5-) lo fields and waste places, Mass. to Va. Also on the Pacific 

 Coast. Nat. from Eu. — Pennsylvania: Phii,adelphia, about ballast. 



2. AIra praecox L. Early Hair-grass. ( Man. p. 116 ; I. F. /. 386. ) 

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

 vania : Northampton, Bethlehem. 



35. DESCHAMPSIA 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.y". j^/. ) 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 ; L.\nc.\ster ; Monroe ; 

 Bucks. 



2. Deschampsia flexuosa (L.) Trin. Wa\'\' H.\ir-gr.\ss. (Man. p. 

 116 ; I. F.y. 3SS.) 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. TRISETUM Pers. 

 1. Trisetum Pennsylvanicum (L.) Beauv. Marsh False OaT. 

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

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

 ampton ; Lancaster ; D.\uphin ; 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. Arrhenat±ierum elatius ( L. ) Beauv. Oat-grass. (Man. p. 118; I. 

 F. f. 396.) In fields and waste places, Me. and Out. to Ga. and Tenn. 

 Also on the Pacific Coast. Nat. from Eu. — Petinsylvania : 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. — 



