VEGETATION OF DESERT MOUNTAINS 305 



Ibidium strictum (Ilydb.) House 

 Ligusticum porteri C. & R. 

 Lonicera involucrata Banks. 

 Merle nsui pratensis Hell. 

 Oreochrysum parryi (Gray) Rydb. 

 Pachistima myrsinites (Pursh) Raf. 

 Pedicularis grayi A. Nels. 

 Peramium decipiens (Hook.) Piper 

 Picea engelmanni Parry 

 Potcntilla diversifolia Lehm. 

 Rubus parvifiorus Nutt. 



All of these 16 species are found in the mountains of New 

 Mexico and Colorado and 11 of them range northward as far as 

 British Columbia. 



A few plants are found in the forested elevations of the Pina- 

 leno range bel ow 9000 feet which are not known from the Santa 

 Catalina Mountains. This group is to be distinguished from the 

 former by the fact that all of its members are growing at eleva- 

 tions which exist in the latter mountains, and they do not there- 

 fore appear to depend upon physical conditions which exist only 

 above the altitude of the highest point in the Santa Catalina 

 range. 



Berberis repens Lindl. 

 Ceanothus integerrimus H. & A. 

 Erysimum wheeleri Rothr. 

 Galinsoga parviflora var. semicalua Gray 

 Pericome caudata Gray 

 Rhamnus betulvfolia Greene 

 Thermopsis pinetorum Greene 

 Veronica serpyllifolia L. 



All of these species are common at their appropriate eleva- 

 tions and in their particular habitats. 



A few species are found above 8000 feet in the Pinaleno Moun- 

 tains which have also been detected in the Santa Catalina range. 

 All of this group are common and widespread in the former and 

 found only in one, two, or in one case in three very restricted 

 localities in the latter. They are: 



Abies arizonica Merriam 

 Acer glabrum Torr. 

 Artemisia franserioides Greene 



