GRAMINEAE. 



VOL. I. 



44- Panicum spretum Schult. Eaton's Panic-grass.- Fig. 354. 



Panicum spretum Schult. Mant. 2: 248. 1824. 

 Panicum Eatoni Nash, Bull. Torr. Club, 25 : 84. 1898. 



Smooth and glabrous. Culms ii-3i tall, erect, 

 at length dichotomously branched and swollen at 

 the nodes ; sheaths much shorter than the internodes, 

 usually more or less ciliate on the margins ; ligule 

 a ring of long hairs ; blades erect, lanceolate, acumi- 

 nate, ii'-4' long, ii"-5" wide; panicle finally long- 

 exserted, dense and contracted, 3'-s' long, ii' or 

 less broad, its branches erect-ascending ; spikelets 

 oval, from over I" to nearly i" long, acutish, the 

 first scale about one-third as long as the spikelet, 

 pubescent, i -nerved, the second and the third scales 

 broadly oval when spread out, 7-nerved, densely 

 pubescent with spreading hairs. 



Along the coast, in damp or wet places, Maine to New 

 Jersey and northern Indiana. May-Aug. 



45. Panicum Lindheimeri Nash. Lindheimer's Panic-grass. Fig. 355. 



P. nitidum Nash, in Britt. & Br. 111. Fl. i : 120. 1896. 



Not Lam. 1797. 

 P. Lindheimeri Nash, Bull. Torr. Club, 24: 196. 1897. 



Culms at first simple, i2'-i8' tall, later profusely 

 dichotomously branched, 2-3 long, glabrous or pubes- 

 cent below. Sheaths less than half as long as the 

 elongated internodes, glabrous, excepting the ciliate 

 margin, or the lower sometimes pubescent ; ligule over 

 2." long ; blades glabrous, or sparingly ciliate toward 

 the base, sometimes puberulent below, the primary 

 ones i '-3' long, iJ"-4" wide, erect or ascending, some- 

 times reflexed, those of the branches i'-i' long, i" wide 

 or less; primary panicle long-exserted, \'-2\' long, 

 ovoid, as broad as long or nearly so, those of the 

 branches smaller and exceeded by the leaves; spikelets 

 about I" long, obovoid, pubescent. 



Common in dry sandy soil, Maine to Ontario and Cali- 

 fornia, south to Florida and Texas. June-Aug. 



46. Panicum leucothrix Xash. Roughish Panic- 

 grass. Fig. 356. 



P. leucothrix Nash, Bull. Torr. Club, 24: 41. 1897. 



Culms i-2 tall, densely tufted, erect, appressed 

 papillose-hirsute, finally branched ; sheaths similarly 

 pubescent but the hairs more spreading; ligule li" 

 long; blades i'-2" long, 2"-$" wide, lanceolate; erect 

 or ascending, firm, softly pubescent on the lower sur- 

 face, ciliate at the base, glabrous on the upper surface; 

 primary panicle i'-2 r long, rarely larger or smaller, 

 broadly ovate, its branches ascending; spikelets a 

 little over i" long and about \ as wide, oval, pubescent 

 with short-spreading hairs. 



In usually dry sandy soil, southern New Jersey to 

 Florida and Texas. Cuba. June and July. 



Panicum Wrightianum Scribn., of the southern states 

 and Cuba, which differs in still smaller spikelets, is re- 

 corded from southern New Jersey. 



