12 
The Colorado Experiment Station 
rado candy-tuft ( Thlaspi coloradense) , double bladder-pod ( Phy - 
saria didymocarpa) , Indian millet (Briocoma cuspidatai), sand¬ 
wort (Arenaria fendleri), oat-grass (Trisetum montanum) , stipa- 
grass (Stipa viridula), fescue-grass ( Festuca arizonica) , stick- 
seed (Lappula occidentals) , phacelia ( Phacelia leucophylla) , ger¬ 
anium (Geranium fremontii) , beard-tongue (Pentstemon humilis), 
vetch (Astragalus shortianus) , and common sage (Artemisia fri- 
gida). The cooler and moister north exposures are frequently 
clothed with Douglas fir (Pseudotsuga mucronata) , aspen (Popu- 
lus tremuloides) , Rocky Mountain maple (Acer glabrum), spring 
anemone or pasque flower (Pulsatilla hirsutissima) , saxifrage 
(Saxifraga rhomboidea), buckbean (Thermopsis divaricarpa), 
bedstraw (Galium bore ale), and false Solomon’s seal (Vagner a 
stellata). 
Fig. 4.—In the Wet Mountain Valley. The view is looking due west. 
Note the bare south exposures and timbered north exposures. 
Fig. 4 is a scene in the Wet Mountain Valley, and it shows 
very clearly the effect of exposure upon local conditions that in¬ 
fluence plant growth. The view is looking due west. Douglas fir 
and white fir clothe the north-facing slope, while grasses and low 
shrubs dominate the south-facing slope; the two plant commun¬ 
ities meet sharply at the crest of the slope. In many of the east- 
west valleys of the Western Slope, pinyon pine and juniper 
abound on the warm, dry, south exposures, while Douglas fir and 
