I 



ROSACEAE 



altitudinal ran^e, commonly occurring in association with yellow 

 pines on high plateau- as those along the Grand. Canyon and on dry 

 slopes of stoop and rocky canyons. It has dense panicles of white 

 flowers and very finely divided loaves. It has distinct erosion 

 control value but is hardly adaptable to conditions where wo have 

 projects at present. It should be a desirable ornamental. It has 

 no, or very low, forage value. 



*Cole ogyne ramosissima or Black Bush, a low, stiff, bushy 

 shrub, covers thousands of acres in pure stand, in northern Arizona 

 and southern Utah • It is especially abundant along the Colorado 

 River in bhc Vermillion Cliffs region. While this is not consider- 

 ed palatable, it raust furnish considerable browse for sheep as 

 flocks are ranged through it when scarcely anything else is avail- 

 able. It is an excellent soil binder, 



P o tro phy ton s pp . There are supposedly two species of this 

 curious rod: plant in the west. They are widely distributed at 

 relatively high altitudes, mostly in limestone regions. They form 

 dense solid masses of roots, oaudiccs and leaves, usually on the 

 face of cliffs. They are only interesting as ornamentals for roc 1 : 

 garden s. 



Holodiscu s dumosus or Rock Spirea, is common at relatively 

 high altitudes throughout the west. It has grayish hairy leaves 

 and dense clusters of whitish flowers. It is a handsome ornamen- 

 tal and may have some value for erosion control. 



: < Dasio phora fruticosa or Shrubby Cinquefoil, sometimes called 

 woody Potent i] la, is a common, low shrub throughout the Pocky Moun- 

 tains from Pew Mexico north. It also occurs from Labrador to Alaska 

 and in Europe and Asia, It is a handsome low shrub with bright yel- 

 low flowers which resemble buttercups, Many mountain valleys arc 

 carpeted with this shrub and erosion stopped or retarded. It is 

 not suitable to low altitudes, dry or alkali sites. 



Throughout the Rooky Mountains at medium and high altitudes 

 are many species of Potent ilia which arc closely allied to D, 

 fru tico sa but which, arc. perennial herbs, mostly of little signifi- 

 cance. Pote nt ill a anscrina, however, is a low creeper occupying 

 overgrazed damp valleys in the mountains. It is a very effective 

 soil binder but a definite indication of land abuse. 



Rubua ariz onica is a Trailing Blackberry not uncommon in the 

 mountains in Santa Cruz and Pima counties in Arizona. It commonly 

 occupies rather protected places either in canyons or on steep 



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