POACEAE 115 



50. P. columbianum Scribn. (P. psammophilum Nash. P. colum- 



bianum ihinium Hitchc. & Chase). Fields and open woods: 

 Me. to Va. 

 Common throughout the range, especially in the pine-barrens. 



51. P. tsugetorum Nash. In dry woods; Me. to Va., 111. and 



Tenn. 

 Throughout the range. 



52. P. Scribnerianum Nash. In dry or moist soil : Me. to Br. Col., 



south to Va., Tex. and Ariz. 



Conn. Throughout. 



N. Y. Throughout, but rare northward. 



N. J. Rare and local in the northern counties except in the 



Delaware Valley, and scattered on the coastal plain, but not in 



the pine-barrens, or east or south of them. 

 Pa. Pike, Northampton, Lehigh, Bucks, Philadelphia, Delaware 



and Chester counties. 



Tertiary, o: Cretaceous, scattered: Older Formations, not very 

 common. 138-220 days. Sea level-1,080 ft. 



53. P. oligosanthes Schult. In dry soil: N. J. to Fla., 111. and 



Tex. 



N. J. Rare and local in Camden, Burlington and Cape May 

 counties. Interesting as being more common out of the pine- 

 barrens than in them.* 



54. P. xanthophysum A. Gray. In dry soil: Que. and Man. to 



Pa. 



Conn. Stafford and South Windsor. 



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



N. J. High Point, Sussex Co. 



Pa. Luzerne and Monroe counties; reported also from Bucks Co. 



but probably incorrectly. 



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

 ward. Not south of the moraine. 11 7-1 68 days. Sea level - 

 3>ooo ft. 



55. P. scoparium Lam. In moist soil: Mass. to N. J., Pa., Fla., 



Okla. and Tex. Also in Cuba. 



N. J. Throughout the coastal plain, specially along the courses 



of streams; not recorded northward. 

 Pa. Tinicum, Delaware Co. 



* See Introduction paragraph 29. 



