46 



Bouteloua racemosa. 



Common in gravelly soil in the valleys. Often seen on low ridges. 

 Bouteloua polystacliya. 



Never seen in patches, like most of the other gramas. With its 

 short, procumbent stems it prefers situations where there is no 

 turf. It is found in a great variety of soils. I saw it in open 

 spaces on high prairies and on low prairies and flats ; some- 

 times on hill-sides. Several specimens were seen at the Sand 

 Hills. It is frequent on the Rio Grande bottom at Presidio. 

 Bouteloua aristidoides. 



Often associated with the preceding, but less abundant. Of the 

 same manner of growth and choice of habitation. 

 Pappopliorum Wriglitii. 



Frequent on many of the mesas and low ridges. 

 Pappopliorum apertum. 



Often seen with the preceding, but less abundant ; but it has a 

 range farther east than its congener. Not rare in valleys be- 

 tween Devil's Eiver and the Pecos, 

 Cottea pappoplwroides. 



Seen in one spot by the side of Medero Crook ; also in two lo- 

 calities in the Chenates ; on a slope at Cibilo Cation, and in a 

 ravine at the southern base. 

 Troidia acuminata. 



This, common east of the Pecos, I saw only in one locality far- 

 ther west, at an arroyo near Musquis. 

 Triodia albescens. 



Seen in a few places by Toy ah Creek. Farther east it is abun- 

 dant in several localities. 

 Triodia avenacca. 



Frequent on some of the lower mesas by Medero Creek. A few 

 specimens were seen at a ravine branching from Cibilo Canon. 

 Triodia JSFealleyi, n. sp. 



Seen only at one locality, on a craggy slope in Cibilo Cation. 



Triodia eragrostoides. 



With the preceding. 

 'Triodia pulcliella. 



Seen at many of the arroyos ; sometimes on the high prairies. 

 A few plants were also seen scattered on the river bottom near 

 Presidio. 

 Triorlia trinermglumis. 



Abundant at Cibilo Canon. Seen at several points near Toyah 

 Creek, 

 Triodia repens, n. sp. 



Seen only in one spot by the side of Limpia Creek (about 15 miles 

 north of Fort Davis), just below a rocky slope. Here, on a 

 level surface a few yards square, it formed a complete turf. 



