416 



MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



dentate. O — Open dry ground, 

 southern Arizona. 



3. Sporobolus vaginifldrus (Torr.) 

 Wood. (Fig. 592.) Annual, branching 

 from base; culms erect to spreading, 

 mostly 20 to 40 cm. tall, sometimes 

 as much as 75 cm.; blades slender, 

 subinvolute, the lower elongate; pan- 

 icles terminal and axillary, slender, 

 mostly not more than 3 cm. long, the 

 terminal exserted or partly included, 

 the axillary included in the sheaths or 

 slightly exserted, late in the season 

 the sheaths swollen and containing 

 cleistogamous spikelets; glumes acute, 

 about equal, 3 to 5 mm. long; lemma 

 as long as the glumes or exceeding 

 them, acute or acuminate, rather 

 sparsely pubescent, sometimes mot- 

 tled with dark spots; palea acuminate, 

 sometimes longer than the lemma. 

 O — Sandy soil or open waste 

 ground, Maine and Ontario to Min- 

 nesota and Nebraska, south to Geor- 

 gia, Texas, and Arizona. 



Figure 593. — Sporobolus neglectus. 

 Plant, X 1; spikelet and floret, 

 X 10. (Deam 33426, Ind.) 



Figure 594. — Sporobolus asper. Plant 

 X 1; glumes and floret, X 10. (Deam 

 42707, Ind.) 



