1885.] 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 Rio 

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

 tation consists of: 



Prosopis juUflora (Mezquit) nnH piibescens (Screw-Bean). 



Zizyphus obtusifolius (Lote-bush). 



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



Kceberlinia spinosa (Junco). 



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

 Wrightii, Bcemeriana, Emoryana. 



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



Bumelia lycioides, lanuginosa, spinosa. 



ParJcinsonia aculeata (Retama). 



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). 



Gocculus Carolinus and diver sifolius. 



Maximowiczia Lindheimeri, with handsome, pendent, scarlet ber- 

 ries. 



Philibertia cynanchoides, blossoming profusely all summer. 



Boulinia unifaria. 



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

 growing thriftily and bearing excellent fruit. 



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

 but unpalatable berries. 



Ipomoea sagittata, pandurata, coccinea (var. hederifolia), Mexicana, 

 sinuata, trifida (Morning Glories). 



Clematis Pitcheri and Drummondii (Virgin's Bower). 



Passijiora fcetida, tenuiloba, affinis, incarnata (Passion Flowers). 



Ampelopsis quinquefolia (Virginian Cree])er). 



Mekania scandens (Chmbiug 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, pliysocalyx. 



Sphoeralcea angustifolia. 



Hoffmanseggia stricta. 



