44 posteisia 



found also many groves of small quak- 

 ing asps no larger than apple trees. 

 The coniferous trees do not usually 

 form dense forests, except occasionally 

 on certain hillsides. The parks are for 

 the most part rather open, permitting 

 the development of a grass flora. With 

 the grasses, especially along rocky 

 ledges, there are many profusely flower- 

 ing perennials, such as harebells {Cam- 

 panula spp-), Eriogonum spp., Allium 

 spp. , species of Aster, Erigeron and Pent- 

 stemon, besides the plants named in 

 the previous paragraphs. 



When a given species of plant has 

 a wide vertical distribution a single trip 

 to the mountains will show it in every 

 stage of development. In the lower 

 altitudes it may be in flower or fruit, 

 higher up in bud, and still higher bare- 

 ly starting from the ground. If, for 

 example, a collector be anxious to ob- 



