Genus 17. 



GRASS FAMILY. 



'53 



47. Panicum huachucae Ashe. Hairy Panic-grass. Fig. 357. 



P. pubescens Nash, in Britt. & Br. 111. Fl. 1 : 121. 1896. 



Not Lam. 1797. 

 P. huachucae Ashe, Journ. E. Mitch. Sci. Soc. 15 : 51. 1898. 

 P. huachucae silvicola Hitchc. & Chase, Rhodora, 10 : 64.' 



1908. 



Culms at -first erect and simple, later profusely 

 branched and leaning or ascending, papillose-hirsute 

 with ascending hairs, the nodes barbed; sheaths papil- 

 lose-hirsute; ligule ¥'-2" long; blades copiously pilose 

 on the upper surface, densely pubescent on the lower, 

 erect to spreading, firm or lax, those of the culm 2-3' 

 long, those of the branches much shorter; primary 

 panicle ii'-4-' long, ovoid, the branches ascending or 

 spreading; lateral panicles much smaller, not exceeding 

 the leaves; spikelets about f" long, pubescent. 



In dry soil, Maine to South Dakota, Florida, Texas and 

 California. June-Sept. Has been mistaken for P. unci- 

 phyllum Trin. 



48. Panicum scoparioides Ashe. Stiff Hairy 

 Panic-grass. Fig. 358. 



Panicum scoparioides Ashe, Journ. E. Mitch. Sci. Soc. 

 15: 53- 1898. 



Culms l°-2l° tall, rather slender, pubescent with 

 ascending hairs, finally branched; sheaths strongly 

 papillose-hispid with ascending hairs; ligule i"-ii" 

 long; blades 2'-^' long, 2i"-4" wide, lanceolate, 

 ascending, glabrous on the upper surface, the lower 

 surface more or less pubescent with scattered spread- 

 ing hairs ; panicle barely exserted, 2'-^' long, its 

 branches ascending; spikelets a little less than li" 

 long and about i as wide, elliptic, pubescent. 



In dry soil, Vermont to Pennsylvania, Delaware and 

 Minnesota. July and August. 



Panicum languidum Hitch. & Chase, of Maine, Massa- 

 chusetts and New York, differs from this and related 

 species by its pointed spikelets. 



49. Panicum villosissimum Nash. White- 

 haired Panic-grass. Fig. 359. 



P. villosissimum Nash, Bull. Torr. Club, 23: 149. 1896. 

 P. atlanticum Nash, Bull. Torr. Club, 24: 346. 1897. 



Papillose-pilose with long white spreading hairs. 

 Culms tufted, at length branched, i2'-2o' tall, erect 

 or ascending, a smooth ring below the nodes which 

 are barbed with spreading hairs; sheaths shorter 

 than the internodes ; ligule a ring of hairs i"-2i" 

 long; blades erect or ascending, rigid, thickish, 

 lanceolate, I £'-4' long, 2"-z\" wide, acuminate, ' 

 middle leaves the longest; panicle ii'-3' long, 

 ii'-2i' wide, the branches and their divisions his- 

 pidulous ; spikelets numerous, obovate to elliptic, 

 about li" long, i" wide, densely pubescent with 

 short spreading hairs. 



Dry soil, Massachusetts to Minnesota, Florida, Texas 

 and Missouri. June-Aug. 



Panicum pseudopubescens Nash, differs in nearly ap- 

 pressed pubescence of the culms and glabrous upper leaf- 

 surfaces. It ranges from Connecticut to Illinois, Florida 

 and Mississippi. 



