236 



CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



DESCRIPTION. 



Vernal form similar to that of P. villosissimum; culms somewhat stiffer, the pubes- 

 cence more silky, appressed on the culms, ascending on the sheaths; ligules 2 to 3 mm,, 

 long; blades somewhat firmer, the pubescence on the upper surface short like that 

 on the lower and sparse or wanting down the center or occasionally glabrous on the 



upper surface; panicles averaging larger, the 

 spikelets not so long-pediceled; spikelets 2.25 to 

 2.4 mm. long, 1.1 mm. wide, obovate-elliptic, 

 obtuse, or slightly pointed, pubescence as in 

 P. villosissimum; second glume slightly shorter 

 than the fruit at maturity; fruit 1.9 mm. long, 

 1 mm. wide, elliptic, subacute. 



Autumnal form usually stiffly spreading, some- 

 times prostrate, culms sparingly branching from 

 the lower and middle nodes after the maturity of 

 the primary panicle, less freely branching than 

 P. villosissimum; the upper surface of the reduced blades usually glabrous except 

 along the margins and at the base; winter leaves as in P. villosissimum. 



This species is very closely allied to P. villosissimum and occasional specimens 

 are about as close to one type as to the other. In these cases the ascending, more 

 silky pubescence of the culms and less pubescent or glabrous upper surface of the 

 blades, together with the stiffer habit, have been used to distinguish P. pseudopu- 

 bescens. 



DISTRIBUTION. 



Fig. 249. — P. pseudopubescens. 

 type specimen. 



From 



Sandy, open woods, Connecticut to Illinois, south to Florida and Mississippi; also 

 in Mexico. 



Connecticut: South Britain, Harger 6031 (Bissell Herb.). 



New Jersey: Atsion, Chase 3566; Camden, Smith; Wildwood Junction, Chase 



3520. 

 Ohio: Cedar Point, Claassen (Gray Herb.). 



Indiana: Miller, Chase 1542, Umbach in 1898; Clark, Umbach 1685; Clark Junc- 

 tion, Bebb 514, 2882; Dune 



Park, V. H. Chase 291, Hill 100 



and 101 in 1905, Umbach 1080. 

 Illinois: Starved Rock, Chase 



1605; Hanover, Gleason & 



Gates 2535, 2539, 2575. 

 Michigan: Saginaw Bay, Morris 



240 in part; Twin Lakes, 



Wheeler in 1900. 

 Maryland: Caroline County, Nor- 

 ton in 1907. 

 District of Columbia: Steele in 



1899. 

 North Carolina: Roanoke Island, Ashe in Curtiss PI. So. U. S. 6452, Chase 



3218, 3222; Wilmington, Chase 3109, 3115, 3147, 3160, Hitchcock 1437, 1474, 



1476, 1484, 1485; Biltmore, Boynton in 1906. 

 South Carolina: Orangeburg, Hitchcock 398, 1380, 1383, 1394, 1401, 1402; 



Fripps Island, Cuthbert 1164. 

 Georgia: Stone Mountain, Hitchcock 397, 1356, 1357. 

 Florida: Lake City, Hitchcock 1013 J. 

 Tennessee: Ducktown, Chambliss 26. 



Fig. 250.— Distribution of P. pseudopubescens. 



