yeoetation ok desert mountains 



297 



the omnipresent Gidierrena gracilis and other herbaceous plants. 

 On the portions of the bajadas nearest the mountain and on 

 the north-facing slopes at 4800 to 5200 feet the shrubbery be- 

 comes more abundant, being open on the level and forming closed 

 thickets on the slopes. The characteristic shrub is Quercus 

 \l r i sea, and almost equally common are Ceanothus greggii, Cer- 

 cocarpus paucidentatus, the semi-succulent Nolina and the 

 suffrutescent Artemisia ludoviciana. Less frequent are Juniperus 

 monosperma, Garrya wrightii, Arctostaphylos pungens and 

 Agave parry i. 



Fig. 3. Slopes of Frye Canon, on the northeast face of the Pinaleno Mountains, 

 howing encinal with scattered individuals of Pinus chihuahuana. 



At the altitude of the uppermost portions of the bajadas 

 it will be found that the interbajadal valleys and the canons of 

 the mountains itself are heavily wooded with evergreen oaks, 

 with Juglans major and Platanus occidentalis along the streams. 

 At elevations as low as 5500 feet, and near the banks of constant 

 streams, it is possible to find numerous shrubs and other plants 

 characteristic of higher altitudes, such as Robinia neomexicana, 

 Quercus submollis, Alnus oblongifolia, Ceanothus integerrimus 

 and Salix sp. 



