45 



Cijnodon dactylon. 



Several plants were seen at the Sand Hills, where it seems to be 

 naturalized. I saw fine lawns of it at Fort Davis, Marfa, and 

 El Paso. 



Clitoris cucullata. 



Common in the gravelly soils of the valleys. Frequent at the 

 Sand Hills. 



Clitoris elegans. 



Gommou on the bottom lands of $ie creeks. 



Trichloris vcrticillata. 



Seen at several points along the. Bio Grande, generally in clumps. 

 Also seen in places along Toy ah Creek. On the Pecos flats I 

 saw a few plants mixed with 8. airoides. It seems to thrive on 

 alkaline soil. 



Bouteloua oligostacliya (Blue grama). 



This well-known grass, so abundant in these western regions, is 

 seen in its greatest perfection on the high prairies, covering- 

 extensive areas. Mixed with some of the other gramas, it oc- 

 curs on the grassy slopes and in wide, gravelly spaces on the 

 mountain-sides. Unlike many of the mountain grasses, the gra- 

 mas are not at their best on the craggy slopes. In many locali- 

 ties the best hay is furnished by a mixture of this and other 

 gramas. 



Bouteloua Mrsuta (Black grama). 



This, with a more extensive range (extending eastward beyond 

 the Brazos, in East Texas), is much less abundant than the 

 blue grama. In some places it is largely mixed with other 

 gramas. Several specimens were seen at the Sand Hills. # 



Bouteloua Havardii. 



Seen in a few places in the Limpia region, and near Musquis 

 Canon ; also at some of the foot-hills on the north side of the 

 Chenates, and at Paisano. 



Bouteloua eriopoda (Woolly-jointed grama). 



One of the most common grasses in the Chenate region. On the 

 lower ridges and prairies just north of the mountains it is gen- 

 erally the prevailing grass, covering large areas. In the gorges 

 of the Chenates, on some of the grassy spots, this and the fol- 

 lowing (B. stricta) constitute the principal growth. On the 

 high prairies it is occasionally found mixed with the blue 

 grama. It is frequent in the Limpia and other mountain re- 

 gions. Several specimens were seen at the Sand Hills. 



Bouteloua stricta. 



Common in several portions of the Chenate region. Seen in 

 abundance on some of the lower ridges at the southern base 

 of the mountains. 



