128 POACEAE 



35. Cinna L. 



Panicle narrow at maturity, its filiform branches erect or drooping; 



' spikelets 5-6 mm. long; first scale much shorter than the second. 1. C. arundinacea. 

 Panicle open, its capillary branches flexuous and drooping; spikelets 



3-4 mm. long; first scale about equalling the second. 2. C. latifolia. 



i. C. arundinacea L. In moist woods and swamps: N. S. to 

 Ont., Ga. and Tex. 



Common throughout the range, except the pine-barrens- 



2. C. latifolia (Trev.) Griseb. In damp woods: Newf. to Br. Col., 

 N. J. and Wash, and in the Alleghanies to N. Car. and in the 

 Rockies to Colo, and Utah. 



Conn. Northern Hartford and Litchfield counties. 

 N. Y. Pine Plains, Dutchess Co. and in the Catskills. 

 N. J. Northern Sussex Co. 

 Pa. Pike, Monroe and Lackawanna Co. 



Tertiary, o: Cretaceous, o: Older Formations, scattered north- 

 ward. Not south of the moraine. 117-158 days. 1,060-4,020 ft. 



36. Agrostis L. 



Palet conspicuous, at least one-half as long as the scale. 



Panicle open in flower, branches long and spreading; upland 



grass. I. A. alba. 



Panicle dense and contracted; brackish marsh and wet sand 

 grass. 2. A. maritime. 



Palet inconspicuous, minute or wanting. 



Flowering scale awned. 3. A. canina. 



Flowering scales awnless, or very rarely with a short awn. 

 Culms weak, decumbent or prostrate at the base; blades 



lax. 4. A . Schweinitzii. 



Culms and blades erect. 



Branches of the panicle capillary, elongated, usually 

 dividing above the middle. 

 Spikelets 1.5-2 mm. long; leaves short. 5. A. hyemalis. 



Spikelets 2.5-3 mm. long; leaves elongated. 6. A. allissima. 



Branches of the panicle not elongated, divided at or 

 below the middle. 

 Spikelets about 2 mm. long; a grass of low 



elevations. 7. A. perennans. 



Spikelets 2.5-3 mm. long; a high mountain grass. 8. A. oreophila. 



1. A. alba L. {A. alba aristata Gray). In fields and meadows 

 nearly throughout N. Am. Native of Europe. 



Throughout the range as a weed. 



