53G 



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



Figure 776. — Bouteloua eludens. Panicle, X 1; spike and spikelet, X 5. (Type.) 



6. Bouteloua chondrosioides (H. 



B. K.) Benth. ex S. Wats. (Fig. 777.) 

 Perennial, tufted, leafy at base; culms 

 erect, 20 to 50 cm. tall; blades 2 to 3 

 mm. wide; axis 4 to 6 cm. long; spikes 

 4 to 6, rhomboid-oblong, ascending, 1 

 to 2 cm. long, the rachis densely 

 pubescent, the tip 3-cleft; spikelets 

 several, subpectinate; rachis broad, 

 densely pubescent on the margin; 

 glumes and fertile lemma densely pu- 

 bescent, the lemma 3-cleft, the divi- 

 sions awn-tipped; rudiment cleft 

 nearly to the base, the middle awn 

 broadly winged, the lateral ones slen- 



der, all spreading. % — Mesas and 

 rocky hills, western Texas to southern 

 Arizona; Mexico and Guatemala. 



7. Bouteloua radicosa (Fourn.) 

 Griffiths. Purple grama. (Fig. 778.) 

 Perennial, tufted, from a stout rhizo- 

 matous base; culms erect, 60 to 80 

 cm. tall; blades 2 to 3 mm. wide, 

 sparsely papillose-ciliate on the mar- 

 gin, mostly aggregate toward the 

 lower part of the culm, the upper part 

 naked; axis 10 to 15 cm. long; spikes 

 mostly 7 to 12, oblong, 2 to 3 cm. 

 long; spikelets mostly 8 to 11; glumes 

 broader than in other species; fertile 





