POACEAE 123 



5. A. lanosa Muhl. In dry sandy soil: N. J. to Fla., Okla. and 



Tex. 



N. J. Scattered locally in Camden Co., and at Cape May (ac- 

 cording to Stone) . 



6. A. tuberculosa Nutt. Sandy soil especially on beach dunes: 



Mass. to Ga. Also about the Great Lakes. 

 Conn. Known only along the beach from Orange westward. 

 N. Y. Rockaway Point and Coney Island, L. I. and on S. I. 

 N. J. Common along the coast and scattered through the interior 



from South Amboy, southward. 



Confined mostly to the sea beaches but encroaching inland in 

 New Jersey. 



28. Muhlenbergia Schreb. 



Panicle contracted, narrow, often slender, its branches erect or ap- 

 pressed. 

 Outer scales J4 as long as the flowering scale or less. I. M. Schreberi. 



Outer scales more than J<£ as long as the flowering scale. 

 Flowering scales awnless or sometimes short awned. 



Outer scales ovate to broadly lanceolate, cuspidate, 



about Yi as long as the flowering scale. 2. M. sobolifera. 



Outer scales subulate, equalling or exceeding the 

 flowering scale. 

 Outer scales about 3 mm. long. 3. M. mexicana. 



Outer scales about 5 mm. long. 4. M. racemosa. 



Flowering scales long-awned. 



Outer scales ]4r% as long as the flowering scale, ovate 



to broadly lanceolate, cuspidate. 5. M. tenuiflora. 



Outer scales equalling the flowering scale, subulate. 6. M. umbrosa. 



Panicle open, its branches long and spreading, slender. 7. M. capillaris. 



1. M. Schreberi Gmel. On dry hills and in woods and waste 



places: Me. to Minn., south to Fla. and Tex. 



Frequent in most parts of our range, except the pine-barrens, 

 decreasing southward. 



2. M. sobolifera (Muhl.) Trin. In rocky woods: N. H. to Minn., 



south to Va., Tenn. and the Ind. Terr. 

 Conn. Throughout, but rare, more common southwestward. 

 N. Y. From the Bronx northward, not common. 

 N. J. Hudson, Essex and Hunterdon counties, increasing north- 

 ward. 

 Pa. Northampton, Bucks, Philadelphia, Delaware, and Chester 

 counties. 



Tertiary, o: Cretaceous, 0: Older Formations, increasing north- 

 ward. 138-207 days. Sea level-1,980 ft. 



