46 postelsta 



conditions are favorable. There are 

 some fleshy fungi. Of plants with 

 conspicuous flowers the following may 

 be mentioned : Moneses uniflora, Kal- 

 mia glauca, Pyrola spp., Pedicularis 

 spp., Pentstemon spp., Elephantella 

 groenlandica, Castilleja spp., Linncea 

 bore alts, Mertensia sibirica, Sedtim 

 rhodanthum, Primula parryi, Polygo- 

 num bistorioides, Gentiana spp. Nearly 

 all the species and some of the gen- 

 era are quite strange to one who is 

 familiar only with the plants of the 

 lower foothills. 



Snow covers the high peaks, except 

 where these are very precipitous, until 

 late spring. Often large snow fields 

 remain the year round. The upper 

 limit for the growth of trees on the 

 mountains of northern Colorado is 

 about 3,700 meters. In some places 

 it is lower, in some places higher. 



