454 RYDBERG: PHYTOGEOGRAPHICAL NOTES 
VII. SAGEBRUSH 
To the woody formations may also be added the Sagebrush 
lands. These are more characteristic of the Submontane Zone, 
but are also found in the Montane Zone above as well as in the 
Sonoran below. The most important shrub is Artemisia tridentata, 
which is found in all three zones. So also is A. cana, but the other 
sagebrushes are most common in the higher zones. As the sage 
lands are open formations, the undergrowth is mostly the same as 
in the dry valleys and on the tablelands. Only a few plants rather 
characteristic of this formation will be mentioned. 
I. SHRUBS 
Chrysathamnus filifolius Artemtsia nova 
Artemisia cana Artemisia tripartita 
Artemisia tridentata 
2. HERBS 
Eriogonum cernuum Penstemon teuchrioides 
Penstemon cyathophorus Castilleja flava 
Penstemon xylus 
New York BOTANICAL GARDEN 
