MANUAL OF THE GRASSES OF THE UNITED STATES 



rachilla, cleft to the base, the lobes 

 rounded, the awns slender, about 

 equaling the tip of fertile lemma; 

 one or two additional rudiments, 

 broad and awnless, sometimes de- 

 veloped. % (B. oligostachya Torr.) 

 — Plains, Wisconsin to Manitoba and 



541 



Figure 787. — Bouteloua breviseta. Panicle, X 1 ; spike- 

 let, X 5. (Nealley 669, Tex.) 



Alberta, south to Arkansas, Texas, 

 and southern California; Mexico; 

 introduced in a few places in the 

 Eastern States. 



Bouteloua gracilis var. stricta 

 (Vasey) Hitchc. Spikes 4 to 6, usual- 

 ly ascending or appressed. % — 

 Rare, Texas and Arizona. 



16. Bouteloua breviseta Vasey. 

 (Fig. 787.) Perennial, wiry, the base 

 perennial, woody, loosely tufted; 

 culms branching, 25 to 40 cm. tall; 

 blades 3 to 6 cm. long, 1 to 1.5 mm. 

 wide, flat or becoming involute, 

 sharp-pointed ; spikes mostly 2, some- 

 times 1, rarely 3, 2 to 3 cm. long; 

 spikelets 30 to 45, about 4 mm. 

 long; fertile lemma pubescent, with 

 3 awns and acuminate intermediate 



Figure 786.— Bouteloua gracilis. Plant, X M; glumes and florets, X 5. (Amer. Gr. Natl. Herb. 384, Nev.) 



