MANUAL OF THE GRASSES OF THE UNITED STATES 



397 



FIGURE 819. Distribution of 

 Sporobolus poiretii. 



acute, about equal, 3 to 5 mm long; lemma as long as the glumes or 

 exceeding them, acute or acuminate, rather sparsely pubescent, 

 sometimes mottled with dark spots ; palea acu- 

 minate, sometimes longer than the lemma. 

 O Sandy soil or open waste ground, Maine 

 and Ontario to Minnesota and Nebraska, 

 south to Georgia, Texas, and Arizona (fig. 821). 

 7. Sporobolus neglectus Nash. (Fig. 822.) 

 Differing from S. vaginiflorus chiefly hi the 

 smaller, paler, plumper spikelets, 2 to 3 mm 

 long, and in the glabrous lemma; lower blades 

 often sparsely pilose; panicles usually entirely hidden in the more 



swollen sheaths. O 



Dry open ground and 



sandy fields, Quebec and 



Maine to North Dako- 

 ta, south to Maryland, 



Tennessee, and Texas ; 



also Washington and 



Arizona (fig. 823). A 



form from Missouri 



(Ozark Mountains), with 



rather strongly pilose 



leaves, has been called 



S. ozarkensis Fernald. 

 8. Sporobolus asper 



(Michx.) Kunth. (Fig. 



824.) Perennial; culms 



erect, often rather stout, 



solitary or hi small tufts, 



60 to 120 cm tall; blades 



elongate, flat, becoming 



involute, 1 to 4 mm wide 



at base, tapering to a 



fine point; panicle ter- 

 minal and axillary, pale 



or whitish, sometimes 



purplish, contracted, 



more or less spikelike, 



usually enclosed at base 



or sometimes entirely in FIGURE s22.sporoboius negiec- 



the inflated upper sheath, e t, P x nt io x l $E?USS t 



5 to 1 5 cm long ; spikelets 



4 to 6 mm long glumes 



rather broad, keeled, sub- 

 acute, the first about half 



as long as the spikelet, 



the second two-thirds to 



three-fourths as long ; 



lemma and palea sub- 



FIGURE 821.-Distribution of equal, glabrOUS, the tip FIGURE 823 o -p^tribu^i n oi 

 Sporobolus vaginiflorus. boat-shaped. 91 



Prairies and sandy meadows, Vermont to Michigan, North Dakota, and 

 Utah, south to Louisiana and New Mexico; eastern Washington (fig. 825). 



FIGURE S20. Sporobolus vagi- 

 niflorus. Plant, X 1; glumes 

 and floret, X 10. (Beam 39615, 

 Ind.) 



Ind.) 



