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



tall; panicle narrow and usually rather compact, 5 to 10 cm long, or 

 longer in large plants; first glume 5 to 7 mm long, the second 8 to 

 10 mm long; lemma 6 to 9 mm 

 long, compressed toward the 

 scarcely beaked summit, sca- 

 brous on the upper part of the 

 keel; awns about equal (the 

 lateral rarely shorter) mostly 

 10 to 15 mm long, about 

 equally divergent at an angle 

 of as much as 45 degrees, flat 



Figure 951.— Aristida ramosissima, X 1. (Deam 

 18549, Ind.) 



Figure 950.— Distribution of 

 Aristida oligantha. 



and without torsion at base. 

 O — Dry open ground, Mis- 

 souri (Courtney); southern 

 Kansas to Texas, west to 

 Nevada and southern Cali- 

 fornia, southward (fig. 956); 

 warmer parts of the Old World. 

 Originally described from Ascen- 

 sion Island. Variable in size 

 from depauperate plants a few 

 centimeters tall with shorter contracted panicle (A. bromoides 



H. B. K.) to tall slender plants 



with large open panicle (A. 



fasciculata Ton*.)- 



15. Aristida intermedia 



Scribn. and Ball. (Fig. 957.) 



Annual, simple or branched, 



20 to 40 cm tall; blades flat 



or involute, mostly less than FlGURE 95 



10 Cm long and 2 Him wide; Aristida ramosissima. 



panicle narrow, slender, loosely 



flowered, 10 to 20 cm long; 



glumes about equal, 1 cm 



long; lemma 8 mm long; awns 



about equal, all somewhat 



divergent, 1.5 to 2 cm long. 



O — Low sandy soil, Indiana 



to Nebraska, south to Missis- 

 sippi and Texas (fig. 958). 

 The measurements of the spikelet are sometimes less than those 

 given, especially in plants attacked by smut. 



Figure 953.— Aristida 

 longespica, X 1 

 (Vasey, D.C.) 



Figure 954.— Distribution of 

 Aristida longespica. 



