250 Part III, Chapter 3. 
a ee an 
while the following range from Colorado northward: 
Alnus tenuifolia Nutt. Rhamnus alnifolia L’Her. 
Ceanothus sanguineus Pursh. Salix candida Willd. 
Picea pungens Engelm. » desertorum Richards. 
Rosa Sayi Schwein. » irrorata Anders. 
Ceanothus ovatus Desf. » glauca L. var. villosa Anders. 
Pachystima myrsinites Raf. Tetradymia Nuttallü Torr. & Gray. 
A Rocky mountain contingent of woody plants occurs from Colorado 
southward to New Mexico and Arizona, a few extending into Texas: 
Ceanothus Fendleri Gray. | Philadelphus microphyllus Gray. 4 
Forestiera neomexicanaGray, to Texas. | Quercus undulata Torr. var. Gambeli 
Prunus angustifolia Marsh. Engelm., to Texas. 4 
Fendlera rupicola Eng. & Gray. 
The vegetation of the southern Rocky Mountains reaches its sonthensteä ; 
limit in the Cordilleran tableland of Texas, which includes the Stockton 
and the Edwards plateau. The altitude in several instances is sufficient % B 
RES 
type. There are large tracts also of high grass plains and scattered Mountain 
masses, with intervening undrained pockets ("bolson flats”)”). The Edwards 
plateau is a common meeting ground for species from the Atlantic forest: 
from the southern Rocky Mountains and the Mexican highlands. The princip: 
Rocky Mountain species, represented on this plateau, are Pinus edulis, Quereus 
Emoryi, Funiperus (Sabina) sabinoides, while isolated islands of the true moul- 
tain forest of Pinus ponderosa, Pinus flexilis, Pseudotsuga Douglasii (= P. taxı- 
Jolia = P. mucronata), Ouercus Emoryi, Pinus edulis are found limited t0 
Guadalupe, Davis and Chisos mountains, 
Great Basin Elements. The Great Basin element consists of those = 
which are widely distributed through the arid states of Arizona, NeW 
Mexico, Utah and Nevada, and which also extend to the Rocky Mountains, 
where they occur either ann: or relatively abundant. The range of eacl 
species in the list below, the Mexican element being marked with asterisk * 
*Acacia Greggii Gray. Coleogyne ramosissima Tot. 
Southern Utah, N. Mexico, Ari- Southern Colorado, Nevada, Anz 
zona, California, N. Mexico. zona. “ 
Ceanothus velutinus Dougl. *Fraxinus pistaciifolia Torr. 
Colorado, Utah, Teton and Bitter- Southern New Mexico, Arizol 
root Mountains. Nevada, western Texas, Mexico. 1 
ı) BrAy, WiıLLıam L.: on Resources of Texas. Bureau of Forestry U. S. Department Aa 
SS 
culture Bulletin No. 47. 1904: 
