4 GRAMINEAE. 



3. Panicum digitarioides Carpenter. Narrow Panicum. (Fig. 245.) 



Panicum carinatum Torr. Bost. Journ. Nat. Hist i: 



J37- X 835- Not Presl, 1830. 

 Panicum digitarioides Carpenter; Steud. Syn. PI. 



Gram. 75. 1855. 



Panicum Curtisii Chapm. Fl. S. States, 573. 1860. 

 Not Steud. 1855. 



Glabrous, culms erect from a long and stout 

 creeping rootstock, 3-5 tall, simple, stout, 

 smooth. Sheaths smooth ; leaves 4 / -io / long, 4"- 

 8" wide, long-acuminate ; panicle linear, 6 / -i2 /r 

 long, its branches \'-^ f long, erect ; spikelets about 

 \W long, ovate, acute; first scale about one-half as 

 long as the spikelet, acute, 3-nerved; second about 

 i" long, 5-nerved and a little exceeded by the 

 3-nerved third one; the fourth 3-nerved, slightly 

 shorter than the third. 



In water, Delaware to Florida and Texas. July-Aug. 



4. Panicum obtusum H.B.K. Blunt Panicum. (Fig. 246.) 



Panicum obtusum H.B.K. Nov. Gen. i: 98. 1815. 



Glabrous, culms erect, i-2 tall, simple or 

 branching at base, smooth. Sheaths smooth ; 

 leaves a^'-g' long, \"-^" wide, usually erect, 

 long-acuminate; panicle linear, 2 / -6 / long; branches 

 ^'-i^' long, appressed ; spikelets about \y z " 

 long, crowded, oval or obovoid, obtuse, turgid ; 

 first scale shorter than the rest, obtuse, 5-nerved; 

 second, third and fourth scales about equal, the 

 second and third 5-nerved, the fourth chartaceous. 



Kansas to Arizona, south to Texas and Mexico. 

 July -Sept. 



5. Panicum hians Ell. Gaping Panicum. 

 (Fig. 247.) 



Panicum dii-aricatum Michx. Fl. Bor. Am. I: 50. 1803. 

 Not I,. 1758. 



Panicum melicarium Michx. Fl. Bor. Am. i: 50. 1803? 

 Panicum hians Ell. Bot. S. C. & Ga. i: 118. 1817. 



Glabrous, culms erect, i-2^ tall, generally simple, 

 sometimes creeping at base, smooth. Leaves $'-5' long, 

 i "-3" wide, acuminate, generally erect; panicle 3'-S' 

 long; branches few, generally spreading, the longer ones 

 often drooping, the lower naked below the middle ; spike- 

 lets about i" long; fourth scale exceeded by the third 

 and its usually empty palet which is much enlarged, 

 generally forcing the spikelet wide open. 



In moist ground. North Carolina to Missouri, south to 

 Honda and Texas. Aug. -Sept. 



