MANUAL OP THE GRASSES OP 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 in 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 (^g. 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 in 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 822.— sporobolus negiec- 



the inflated upper sheath, tm ' 



vagi- 



FlGURE 820— Sporobolus 

 niflorus. Plant, X 1; glumes 

 and floret, X 10. (Deam Z96U 

 Ind.) 



floret, 

 Ind.) 



X 10. (Deam 33426, 



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- 

 equal, glabrous, the tip 

 boat-shaped. % — 

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

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



Figure 821.— Distribution 

 Sporobolus vaginiflorus. 



Figure 823.— Distribution 

 Sporobolus neglectus. 



