GENUS 17. GRASS FAMILY. 143 



17. Panicum longifolium Torr. Long-leaved Panic-grass. Fig. 327. 



Panicuin longifolium Torr. Fl. U. S. 149. 1824. 



Culms erect, i-2 tall, slender, simple, or occa- 

 sionally with a single lateral panicle, flattened, 

 smooth and glabrous. Sheaths smooth and gla- 

 brous; blades 8'-i2' long, \"-2\" wide, acuminate 

 into a long, slender point, rough, glabrous; ligule 

 short, pilose ; panicles 5'-o/ long ; primary branches 

 long and slender, spreading, secondary very short, 

 appressed, generally bearing 1-3 spikelets ; spikelets 

 i"-ii" long, acute-; first scale acute, about one-half 

 as long as the acuminate second one ; third scale 

 equalling the second, acute, one-third longer than the 

 elliptic obtuse fourth one, which is sometimes 

 minutely pubescent at the apex. 



Moist soil, Rhode Island to Maryland, Florida, Missis- 

 sippi and Texas. Aug.-Sept. 



18. Panicum stipitatum Nash. Tall Flat Panic-grass. Fig. 328. 



Panicum elongatum Pursh, Fl. Am. Sept. 69. 1814. Not 



Salisb. 1796. 

 Panicum stipitatum Nash, in Britt. Man. 83. 1901. 



Culms erect, 3-S tall, much branched, stout, 

 compressed, smooth. Sheaths smooth and gla- 

 brous, compressed; blades i long or more, 2" -4" 

 wide, acuminate, scabrous; panicles pyramidal, 

 terminating the culm and branches, 4'-: 2' long; 

 primary branches spreading or ascending, the sec- 

 ondary appressed or divaricate; spikelets about ii" 

 long, crowded, acuminate ; first scale acute or 

 acuminate, one-third the length of the equal or 

 nearly equal second and third; fourth scale narrowly 

 elliptic, about one-half as long as the third and 

 raised on a delicate stalk about \" long. 



Moist soil, southern New York and New Jersey to 

 Kentucky, Missouri, Georgia and Louisiana. July-Sept. 



19. Panicum depauperatum Muhl. Starved Panic-grass. Fig. 329 



Panicum strictum Pursh Fl. Am. Sept. 60. 1814. JNoi 



R. Br. 1812. 



Panicum depauperatum Muhl. Gram. 112. 1817. 



Panicum involutum Torr. Fl. U. S. 124. 1824. 



Culms erect, 15' tall or less, simple or branched at 

 base. Sheaths glabrous or hirsute ; blades erect, elon- 

 gated, i"-2" wide, up to 8' long, mostly crowded at 

 base and equalling or one-half as long as the culm, the 

 upper culm leaf often much exceeding the panicle; 

 primary panicle generally much exserted from the upper 

 sheath, I'-T,' long, elliptic to linear, its branches 

 ascending or erect ; secondary panicles on very short 

 basal branches and often concealed by the lower leaves ; 

 spikelets glabrous, i3"-2" long. 



In dry places, Maine to Minnesota, south to Georgia 

 and Texas. June-Sept. 



