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



pilose at base with stout awns and subacute intermediate lobes; 

 rudiment bearded at summit of rachilla-joint, cleft to the base or 

 nearly so, the awns equal, a second rudiment, broad and awnless, 

 sometimes developed. © (B. procumbens Griffiths.) — Open ground, 

 Texas to Colorado, Utah, Arizona, and Mexico; wool waste, Maine; 

 Ecuador to Argentina (fig. 1091). 



10. Bouteloua barbata Lag. Sixweeks grama. (Fig. 1092.) 

 Annual, tufted, branching, erect to prostrate, often forming mats with 



Figure 1086.— Bouteloua eludens. Panicle, X 1; spike and spikelet, X 5. (Type.) 



ascending ends, the culms as much as 30 cm long; foliage scant; blades 

 1 to 4 cm long, 1 to 1.5 mm wide; spikes 4 to 7, 1 to 2 cm long; spike- 

 lets 25 to 40, 2.5 to 4 mm long, nearly as broad; fertile lemma densely 

 pilose at least along the sides, usually throughout, the awns from 

 minute to as long as the body, the intermediate lobes subacute to 

 obtuse ; rudiment from obscurely to conspicuously bearded at summit 



