HITCHCOCK AND CHASE NORTH AMERICAN PANICUM. 



63 



prominent, hispid, the axis and branches scabrous only or sometimes sparsely pilose; 

 spikelets 2.5 to 3.3 mm. long (usually about 3 mm. long), 1 mm. wide, turgid, 

 lanceolate-elliptic, acuminate; first glume about two-fifths the length of the spikelet, 

 pointed, the midnerve scabrous toward 

 the apex; second glume slightly longer 

 than the sterile lemma, both much ex- 

 ceeding the fruit, 9-nerved, the nerves 

 scabrous toward the apex, the palea of 

 the sterile lemma wanting; fruit 1.7 to 

 1.8 mm. long, 0.9 mm. wide, elliptic. 



This species differs from P. capillare 

 in being on the average lower, in hav- 

 ing shorter, less pubescent blades 

 crowded toward the base of the plant, 

 shorter, exserted panicles with divari- 

 cate branches, and larger spikelets. 



The plants are often depauperate and tufted and the blades sometimes white- 

 margined . 



Occasional specimens, as Mearns 743, Parish 1081 and Rydberg 1538, scarcely branch- 

 ing at the base and with longer blades, approach P. capillare. 



Fig. 45. — Distribution of P. barbipulvinatum. 



DISTRIBUTION. 



Open ground, waste places and cultivated fields, Wisconsin, Minnesota to British 

 Columbia, south to Texas and southern California. 



Illinois: Oquawka, Patterson. 



Wisconsin: Madison, Agr. Exp. Sta. (probably transient adventive). 



Minnesota: Fort Snelling, Mearns 755; Hennepin County, Sandberg in 1889; 

 Duluth, Hitchcock 5083. 



North Dakota: Medora, Brannon 134, Bismarck, Field 1867; Devils Lake, Hitch- 

 cock 5050. 



South Dakota: Hot Springs, Rydberg 1096; White Horse Camp, Griffiths 278; 

 Cheyenne River, Wallace 2; Bellefourche, Griffiths 399; Huron, Griffiths 7. 



Nebraska: Simeon, Bates 1114; North Platte, Plank 38; Central City, Rydberg 

 2011, Shear 264; Niobrara, Clements 2705; Hooker County, Rydberg 1538; 

 Grant County, Rydberg 1788. 



Kansas: Bucklin, Hitchcock in 1892; Ulysses, Thompson 56; Syracuse, Thomp- 

 son 134; Tribune, Reed in 1892; Osborne City, Shear 152. 



Texas: Abilene, Tracy 8295; Paloduro, Gardner 24; without locality, Nealley 

 in 1889. 



Montana: Great Falls, R. S. Williams 843; Silesia, Griffiths & Lange 15; Upper 

 Big Horn River, Blankinship 179; Missoula River, Scribner 328; Glendive, 

 Ward in 1883; Billings, Williams & Griffiths 246; Manhattan, Shear 436. 



Wyoming: No Wood Creek, Williams 2847; Sand Creek, E. Nelson 4984; Sybille 

 Creek, E. Nelson 481; Badger, A. Nelson 8346; Cheyenne River, Gey er in 

 1839; Buffalo Fork, Tweedy 93, 95; Newcastle, Griffiths 684; Yellowstone 

 National Park, Chase 5251, 5253, Hitchcock 2114, Rydberg & Bessey 3544. 



Idaho: St. Anthony, Merrill & Wilcox 152; Merrill 43; Shoshone, Evermann in 

 1893; Rathdrum, Sandberg, Heller & MacDougal 713; Caldwell, Chase 47 '46. 



Washington: Kittitas County, Sandberg & Leiberg 431; Waitsburg, Horner 526; 

 Streptoe, Vasey 3065; Prosser, Cotton 625, 891; Spokane, Chase 4986; Lake 

 Chelan, Elmer 484, 848. 



British Columbia: Sicamous, Macoun 6 in 1889, 



