284 



CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



glabrous; first glume about one-third the length of the spikelet, acute; second glume 

 and sterile lemma subequal, barely or scarcely equaling the fruit at maturity, strongly 

 nerved; fruit 2.8 to 2.9 mm., long, 1.8 to 1.9 mm. wide, broadly elliptic, minutely 

 apiculate. 



Autumnal form branching from the middle and upper nodes at about the maturity 

 of the primary panicle; the branches longer than the internodes, and late in the season 



producing crowded branchlets 

 with ascending, not greatly re- 

 duced, blades and small, partially 

 included, panicles from their up- 

 per nodes. 



This species is very variable in 

 the matter of pub escenc e . An un- 

 usually hispid Washington speci- 

 men, Elmer 763, was considered 

 worthy of varietal rank by Scrib- 

 ner and M«*rill and bears a her- 

 barium name, but Moffatt 1863, 

 Miller, Indiana, is quite and 

 others nearly as hispid, while other Pacific coast specimens are not more hispid 

 than eastern specimens. Glabrous and hispid sheaths are commonly found on the 

 same specimen ' in this species. A few Mississippi specimens with blades softly 

 pubescent beneath and spikelets 3.2 to 3.6 mm. long, suggest an approach to P. 

 ravenelii Scribn. & Merr. These are: Jackson, Hitchcock 1295, 1296; Starkville, 

 Tracy 42, 1752. 



DISTRIBUTION. 



Fig. 319. — P. scribnerianum. From type specimen. 



Sandy soil or dry prairies, Maine, Ontario, and westward to the Pacific; south to 

 Maryland and Arizona. 



Maine: South Berwick, Parlin in Harvey, Maine Weeds 1245. 



New Hampshire: Walpole, Fernald 280 (Gray Herb.). 



Vermont: Westminster, Robinson in 1898. 



Massachusetts: Wellesley, Smith 731; Ipswich, Oakes; Essex County, Conant in 

 1881. 



Connecticut: Oxford, Harger in Kneucker Gram. Exs. 425; Rocky Hill, Wilson 

 1256; Farmington, Bissell 5563; Southington, Andrews 51. 



Rhode Island: Providence, Collins in 1887 (Brown Univ. Herb.). 



New York: Ithaca, Ashe. 



Ontario: Sarnia, Macoun 26328; Sandwich, Macoun 26329. 



New Jersey: Glenlock, Heritage in 1897; Morris Plains, Mackenzie 1611; Passaic 

 County, Nash in 1893. 



Pennsylvania: Safe Harbor, Porter in 1864; Germantown, Stone 4 in 1889; 

 Easton, Porter in 1895, 1896, and 1898. 



Ohio: Erie County, Mertz 147; Cedar Point, York 6789; Bowling Green, Keller- 

 man 6894. 



Indiana: Miller, Moffatt 1863, Umbach in 1897; Elston, Dorner 88. 



Illinois: Hanover, Gleason & Gates 2598; Beach, Umbach 2365; Chicago, Chase 

 in 1896; Joliet, Skeels 250; Romeo, Umbach 1704; Starved Rock, Chase 1607, 

 Greenman, Lansing & Dixon 156; Wady Petra, V. H. Chase 922; Marshall 

 County, V. H. Chase 1792; Galva, V. H. Chase 1749; Peoria, McDonald 32. 



Michigan: Grand Rapids, Crozier; without locality, Wheeler 97. 



Minnesota: Fort Snelling, Mearns 771; Spring Grove, Rosendahl 260; Minneapolis, 

 Sheldon in 1895. 



