DRY GRASSLAND OF A MOUNTAIN PARK 



259 



S. minor. This is an aspect of dry grassland most often de- 

 veloped on hypoxerophytic slopes and may be considered a 

 more or less temporary community intermediate between the 

 Stipa association and the Muhlenbergia-Danthonia society of 

 the dry grassland. Whether this ever actually develops into a 

 Stipa community seems somewhat doubtful. It is more likely 



Fig. 4. M uhlenbergia-Aragallus society in the foregound showing flowering 

 scapes of Aragallus lamhertii. A small patch of the Muhlenbergin-Danthonia 

 society is seen farther back where the man is standing. It will be noticed that 

 the plants of the dry grassland are of low growth. The three trees are limber 

 pines, Pinus flexilis. 



that it passes to the Muhlenbergia-Danthonia stage. Plants 

 other than those named are found in the Eriogonwn society 

 but no one species in considerable abundance. The sulphur 

 flower {Eriogonum umhellatum) often forms a horizontal yellow 

 band at the base of a knoll or part way down on a sloping creek- 



