194 



CONTRIBUTIONS FEOM THE NATIONAL HERBARIUM. 



the ends; spikelets oval, 2 mm. long, 1 mm. wide, glabrous; first glume one-fourth to 

 one-third as long as the spikelet, acute; second glume and sterile lemma equal, cover- 

 ing the fruit at maturity; fruit elliptic, 1.8 mm. long, 1 mm. wide, obscurely apiculate. 



Autumnal form diffusely branched, forming very large, topheavy reclining bunches, 

 the slender branchlets recurved, the numerous flat blades horizontally spreading. 



Closely allied to P. dichotomum L., from which it differs in the vernal form in having 

 usually wider blades and bearded lower nodes and fruit covered by the equal second 

 glume and sterile lemma; the autumnal form is distinguished by the large topheavy 

 reclining tufts. 



DISTRIBUTION. 



Sterile or rocky woods, Massachusetts to Michigan and south to Georgia and eastern 

 Texas. 



Massachusetts: Maiden, Frohock in 1879 (N. E. Bot. Club Herb.). 



Connecticut: Southington, Andrews 18, Bissell 5577; Groton, Graves 12. 



New York: St. Albans, Bicknell in 1905. 



New Jersey: South Amboy, Mackenzie 1548. 



Pennsylvania: Easton, Porter in 1895; Lancaster County, Heller 4776. 



Ohio: Vinton, Kellerman 6886. 



Indiana: Dune Park, Hill 129 in 1906; Clarke County, Deam 6577; Brown 



County, Beam 6467a. 

 Michigan: Port Huron, Dodge in 1899; Park Lake, Wheeler 17 (both in Hitchcock 



Herb.). 

 Missouri: Eagle Rock, Bush 148; Monteer, Bush 2877, 3529, 4733; Swan, Bush 



3369, 3456A, 4473; Pleasant 



Grove, Bush 313, 720; Howell 



County, Bush 51; Chadwick, 



Bush 4458. 

 Delaware: Wilmington, Canhy 10 



in 1891; Centerville, Chase 



3620, Commons 296. 

 Maryland: Riverdale, Chase 3643; 



Lanham, Chase 3484; Chesa- 

 peake Junction, Hitchcock 



1641, 2411; Beltsville, Chase 



3747, 3758; High Island, Pol- 

 lard 323. 

 District op Columbia: Hitchcock 123, 125, Kearney in 1897. 

 Virginia: Smyth County, Small in 1892; Arlington, Hitchcock 124; Clifton 



Forge, Tidestrom 22. 

 West Virginia: Fayette County, Kellerman 6903. 

 North Carolina: Biltmore, Biltmore Herb. 800a in part; Caraleigh Junction, 



Chase 3090; Wards Mill, Chase 3188. 

 South Carolina: Orangeburg, Hitchcock 360, 1416. 

 Georgia: Stone Mountain, Chase 4519, Hitchcock 359, 1350. 

 Kentucky: Harlan County, Kearney 35 in part, 57 in part. 

 Tennessee: Nashville, Gattinger in 1884 (Univ. Tenn. Herb.). 

 Alabama: Pisgah, Chase 4469; Scottsboro, Chase 4502. 

 Mississippi: Saratoga, Tracy 8403. 



Arkansas: Benton County, Plank 9, 10a, 41; Fulton, Bush 2532. 

 Louisiana: Shreveport, Hitchcock 1252 . 

 Texas: Houston, Plank 93; Mineola, Reverchon 4147. 

 Oklahoma: Poteau, Hitchcock in 1903 (Hitchcock Herb.). 



Fig. 194.— Distribution of P. barbulatum. 



