HITCHCOCK AND CHASE NORTH AMERICAN PANICUM. 



157 



3.5 to 6 cm. long, 3 to 6 mm. wide, a few long hairs at the rounded base, scabrous on 



both surfaces, not pubescent; spikelets 2.1 to 2.4 mm. long, 1.2 to 1.3 mm. wide, nearly 



or quite glabrous. 

 Autumnal form similar to the vernal, remaining simple or late in the season bearing 



simple branches from the lower, rarely from the basal, nodes. 

 The above-mentioned types are both of this form, but material examined shows a 



much less clear distinction from P. linearifolium, with which this species seems to 



intergrade. The division is here based on a com- 

 bination of stiffer habit, glabrous sheaths, shorter, 

 broader, and firmer blades, and less pubescent 

 spikelets. In many specimens, however, having 

 the other characters enumerated the blades are as 

 long as in many specimens of P. linearifolium. The 

 following represent these intergrading specimens: 

 Biltmore Herb. 8342, Chase 3290, 3382, Jones, Bur- 

 lington, Vermont, in 1892, Knight 55, 57, Parlin 

 1190, Porter, Easton, Pennsylvania, in 1895, 1897, 

 and 1898. 

 In habit, especially as seen in the field, P. werneri often suggests P. depauperatum. 



The following specimens, with slightly pointed spikelets 2.5 to 2.8 mm. long, approach 



that species: Briggs 1248, Graves 7, Eggleston 1757, H. W. Merrill 44. 



Fig. 142.— P. werneri. From 

 type specimen. 



DISTRIBUTION. 



Sterile woods and knolls, Maine to Minnesota, south to Ohio and Texas. 

 Maine: Penobscot County, Fernald 506, Knight 55, 57; Chesterville, Chase 3299; 



Fayette, Chase 3382; North Berwick, Parlin 1190, 1502, 1806; Hiram, H. W. 



Merrill 44, 47; Orono, Briggs 1248. 

 New Hampshire: Laconia, Carter 101, 242 (Hitchcock Herb.). 

 Vermont: Burlington, Jones in 1892; Eggleston 1757. 

 Massachusetts: Sheffield, Hoffmann in 1901. 

 Connecticut: Ledyard, Graves 16; 



Volunteer, Graves 17; Frank- 

 lin, Woodward in 1906; South- 



ington, Chamberlain &: Bissell 



in 1903; Waterford, Graves 7. 

 New York: Tripoli, Burnham in 



1897; Ithaca, Ashe, Rowlee in 



1892; New York, Bicknell 



in 1895. 

 Ontario: Toronto, Biltmore Herb. 



8342; Kingston, Fowler in 1898; 



Kingston Mills, Klugh in 1907; 



Algonquin Park, Macoun 21957 . 

 New Jersey: Berkeley Heights, Mackenzie 2251. 

 Pennsylvania: Easton, Porter in 1895, 1897, and 1898. 

 Ohio: Painesville, Werner 60, 65 (both in Hitchcock Herb.). 

 Michigan: Flint, Clark (Field Mus. Herb.). 

 "Wisconsin: Rainbow Rapids, Cheney 1345. 

 Minnesota: Chisago County, Sandberg in 1886. 

 Missouri: Swan, Bush 2913, 2926. 

 Delaware: Centerville, Commons 358. 

 Texas: Dallas, Reverchon in 1876 (Gray Herb.). 



Distribution of P. werneri. 



