56 



CONTBIBUTIONS FROM THE NATIONAL HEKBARIUM, 



as much as 30 cm. long, 2 to 6 mm. wide, rarely narrower; panicles rather few-flowered, 



oblong, narrow, 10 to 20 cm., rarely 30 cm. long, about 

 one-third as wide, the branches at first narrowly ascend- 

 ing, somewhat spreading at maturity, the peduncle of 

 the panicle not brittle and readily breaking as in P. 

 capillare; spikelets long-pediceled, 3.1 to 3.5 mm. long, 

 0.9 to 1 mm. wide, lanceolate, acuminate; first glume 

 about one-third the length of the spikelet; second glume 

 slightly longer than the sterile lemma, both 7 to 9-nerved, 

 much exceeding the fruit, the palea of the sterile floret 

 wanting; fruit 2 mm. long, 0.9 mm. wide, elliptic. 



This species is distinguished from P. capillare by the 

 more slender culms, less dense pubescence, narrower 

 blades, the narrow, less diffuse panicles and the longer, 

 acuminate spikelets; and from P. philadelphicum by 



the narrow panicle and larger, acuminate spikelets. 



Fig 



-P. flexile. From type 

 specimen. 



DISTRIBUTION. 



Sandy, mostly damp soil, meadows and open woods, Ontario to South Dakota, south 

 to Florida and Texas. 



Ontario: Sarnia, Dodge 128, 130, Macoun 26332; St. Clair River, Dodge 124; 



Birch Island, Macoun 26331; Point Edward, Macoun 26330. 

 Pennsylvania: Lancaster County, Heller 701, 4777, 4786, Porter in 1862, Small 



in 1890 and 1892. 

 Ohio: Erie County, Moseley in 1895; Columbus, Werner 6777. 

 Indiana: Clarke, Umbach in 1898. 

 Illinois : Chicago, Bebb 2928, Chase 



1474, 1479, 1729, 2006, Hill in 



1901; Ingraham in 1893; Beach, 



Umbach 2543; St. Clair County, 



Eggert 241. 

 Michigan: Port Huron, Dodge in 



1909; Orion, Farwell 893; Jack- 

 son County, Wheeler in 1892. 

 South Dakota: Stearns, Wallace 



46. 

 Iowa: Cedar Rapids, Pammel in 



1889 (Mo. Bot. Gard. Herb.). 

 Missouri: Glenwood, Bush 3295; St. Louis, Eggert in 1875; Dodson, Bush 848; 



Eagle Rock, Bush 384; Noel, Bush 5259. 

 District of Columbia: Steele in 1896 and 1898. 

 Virginia: Four-Mile Run, Chase 5444. 

 West Virginia: Peters Mountain, Steele 281. 

 Florida: Without locality, Curtiss in 1886. 

 Kentucky: Bell County, Kearney 312. 

 Tennessee: Knoxville, Kearney in 1893, Ruth 66; Johnson City, 



Cocke County, Kearney 960; Nashville, Gattinger in Curtiss N, 



3581 J, 3582a, and J. 

 Alabama: Monte Sano, Baker in 1897; Jackson County, Chase 4492. 

 Mississippi: Starkville, Chase 4453, Kearney 72, 88 in part. 

 Arkansas: Benton County, Plank 12, 107; Fulton, Bush 906. 

 Texas: Clarksville, Plank 6, 10 in part. 



Fig. 37.— Distribution of P. flexile. 



Canby 221; 

 Amer. PL 



