1886.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 455 



Valleys are generally well covered with shrubbery, sometimes thin 

 and scattered, as on the Upper Pecos, or dense, as on the Lower Eio 

 Grande where it forms an impenetrable chaparral. This shrubby vege- 

 tation consists of: 



Prosopis juliflora (Mezquit) and pubescens (Screw-Bean). 



Zizyphus obtusifolius (Lore-bush). 



Condalia obovata (Capul or Blue-Wood), Mexicana and spathulata. 



Kceberlinia spinosa (Junco). 



Acacia Farnesiana (Huisache), Jiexicaulis (Ebony), Jilicina, 

 Wrightii, Boemeriana, Emory ana. 



Mimosa biuncifera (Una, de Gato), boreolis, Lindheimeri. 



Bumelia lycioides, lanuginosa, spinosa. 



Parlinsonia aculeata (Betama). 



Ptelea trifoliata (Shrubby Trefoil). 



Lantana macropoda and Camara. 



Lippia lycioides. 



Lycium Berlandieri, puberulum, Carolinianum, 



Sophora secundiflora (Frijolillo) and affinis (east of the Nueces). 



Porliera angustifolia (Guayacan). 



Celtis pallida (Granjeno). 



Colubrina Texensis. 

 Many vines climb over trees and shrubs: 



Rhus Toxicodendron (Poison Ivy). 



Smilax tamnoides (Fiddle-shaped Greenbrier). 



Cocculus Carolinus and diver sifolius. 



Maximowiczia Lindheimeri, with handsome, pendent, scarlet ber- 

 ries. 



Philibertia cynanchoides, blossoming profusely all summer. 



Boulinia unifaria. 



Vitis candicans, riparia, rupestris, aestivalis, all edible Grapes 

 growing thriftily and bearing excellent fruit. 



Vitis incisa, indivisa, bipinnaia, wild Grapes with pretty foliage 

 but unpalatable berries. 



Ipomcea sagittata, pandurata, coccinea (var. heder if olia), Mexicana, 

 sinuata, trifida (Morning Glories). 



Clematis Pitcher i and Drummondii (Virgin's Bower). 



Passiflorafwtida, tenuiloba, affinis, incarnata (Passion Flowers). 



Ampelopsis quinquefolia (Virginian Creeper). 



Mekania scandens (Climbing Hemp- Weed). 



Anredera scandens (Texas Madeira Vine). 

 Of the many herbs growing on valley bottoms, the most common and 

 conspicuous are: 



Callirrhoe involucrata, digitata, pedata (Purple Mallows). 



Sida hederacea, lepidota, physocalyx. 



Sphceralcea angustifolia. 



Hoffmanseggia stricta. 



