474 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. [1886. 



Asclepias longicornu, 

 Jatropha Berlandieri. 

 Talinum sarmentosum. 

 Oxalis dichondrcefolia. 

 Ionidium lineare. 

 Siphonoglossa Pilosella. 

 Aristolochia longiflora. 



And also the following Composites : 

 Conoclinium dissectum. 

 Varilla Texana. 

 Aphauostephus ramossissimus. 

 Gymnosperma corymbosa. 

 Ghcetopappa modesta. 

 Encelia subaristata. 

 Gutierrezia eriocarpa. 

 Palafoxia Texana. 

 Bigelovia coronopifolia. 

 Verbesina encelioides. 



The prevalent Grasses are : 



Buchloe dactyloides (Buffalo-Grass). 



Bouteloua oligostachya, Texana, polystachya, Humboldtiana. 



Ghloris cucullata. 



Panicum lachnanthum, autumnale, virgatum, crus-galli. 



Hilaria cenchroides and mutica. 



Eragrostis megastachya and reptans var. capitata. 



Triodia mutica. 



Andropogon scoparius and contortus. 



Pappophorum vaginatum. 



Paspalum Iceve. 



Genchrus myosuroides. 



Spartina gracilis. 



Arundo Donax. 



Sporobolus Wrightii. 

 Three miles below Eagle Pass, the Eio Escondido, on the Mexican 

 side, empties into the Rio Grande. It is a clear, swift stream shaded 

 With Pecan, Hackberry, and Wild Mulberry (Moms microphylla), over 

 which climb luxuriantly the Mustang Grape (Vitis candicans) and a 

 quinquefoliate form of Poison Ivy. On the bluffs above are groves of 

 fine Live Oak extending thence, along the hill tops, into the interior of 

 the State of Coahuila. 



The general features of the vegetation do not change much down to 

 Laredo. The narrow valley, sparsely fringed with timber, is contained 

 within lines of broken bluffs, or cuts its course through high, gravelly 

 mesas. It expands at rare intervals, affording farming land to a few 

 ranches. The shrubbery becomes denser, larger, and extends farther 



