HITCHCOCK AND CHASE — NORTH AMERICAN PANICUM. 21 7 



DESCRIPTION. 



Vernal form talle* and more slender, brighter green and less densely pubescent than 

 in P. huachucae; culms 30 to 75 cm. high, suberect or ascending, papillose-pilose with 

 spreading hairs; nodes bearded with reflexed hairs, usually a glabrous ring below; 

 sheaths papillose-pilose; blades thin, lax and spreading, 5 to 10 cm. long, 6 to 12 mm. 

 wide, the veins inconspicuous; upper surface sparsely short-pilose or with copious 

 long hairs toward the base; lower surface pubescent and with a satiny luster; panicles 

 exserted, 5 to 8 cm. rarely 10 cm. long, nearly as wide, rather densely flowered, the 

 axis pilose, the flexuous, fascicled branches spreading, with short spikelet-bearing 

 branchlets at the base of the fascicles; spikelets 1.6 to 1.8 mm. long, 0.8 to 1 mm. wide, 

 elliptic-obovate, at maturity subobtuse, pubescent with spreading hairs; first glume 

 one-fourth to one-third the length of the spikelet, obtuse 

 or subacute; second glume and sterile lemma subequal, 

 slightly shorter than the fruit at maturity; fruit 1.5 mm. 

 long, 0.8 to 0.9 mm. wide, elliptic, subacute. 



Autumnal form more or less decumbent, the numer- 

 ous fascicled branches shorter than the primary inter- 

 nodes, at least late in the season, the reduced spreading 

 leaves sometimes nearly glabrous above except for a few 

 long hairs near the base. 



The following specimens represent an extreme form 

 with the upper surface of the blades nearly or quite glabrous, thus approaching P. 

 tennesseense. They differ from that species in the thin, lax blades, with no marked 

 white margin and without conspicuous veins. Maine: Westbrook, Richer 666; Orono, 

 Fernald 503; Massachusetts: Framingham, Smith 739; Connecticut: Franklin, 

 Graves 166; Rhode Island: Providence, Battey in 1886; New York: Ithaca, Ashe 

 in 1898; New Jersey: Bear Swamp, Stone 3; Pennsylvania: Easton, Porter in 1898; 

 Germantown, Stone 5, 9; Iowa: Appanoose County, Fitzpatrick 38; District of 

 Columbia: Kearney 33, Steele in 1900; North Carolina: Chapel Hill, Chase 3049, 

 3062, 3067; Tennessee: Polk County, Kearney 328; Texas: Ennis, Smith in 1897; 

 Oklahoma: Chelsea, Bush 1210. 



Fig. 223.— P. huachucae silvicola. 

 From type specimen. 



DISTRIBUTION. 



Open woods and clearings, Maine to northern Florida, west to Michigan, Nebraska, 

 and Arizona. 



Maine: Falmouth, Chamberlain 513; Brewer, Knight 51; South Berwick, Parlin 

 1181; Southport, Fernald 509. 



New Hampshire: Langdon, Fernald in 1899. 



Vermont: Burlington, Jones in 1898; Brandon, Knowlton in 1882. 



Massachusetts: Salem, Sears in 1883; Wellesley, Smith 735. 



Connecticut: Southington, Andrews 36, 64, 66; Groton, Graves 8; Waterford, 

 Graves 156. 



Rhode Island: Providence, Battey in 1886. 



New York: Sylvan Beach, Maxon 550; Oneida, Haberer in 1900, House 1136; 

 Washington County, Bumham 14, 23; Gansevoort, Peck in 1897; Jamaica, 

 Bicknell in 1904; Port Washington, Bicknell in 1908. 



Ontario: Gait, Herriottt, 61, 93; Windsor, Macoun 26334. 



New Jersey: Clifton, Nash in 1892; South Amboy, Mackenzie 2159, 2169; Wild- 

 wood, Chase 3508; Forked River, Chase 3580; Berkeley Heights, Mackenzie 

 2249; Milburn, Mackenzie 2137; Cranberry Lake, Mackenzie 2197. 



Pennsylvania: Refton, Heller 4791; Mount Hope, Heller 4785; McCalls Ferry, 

 Rose & Painter 8133; Easton, Porter in 1895. 



