PIPER FLORA OF THE STATE OF WASHINGTON. 



63 



Along the limit of the meadows in what have been called " pumice 

 fields " a very different series of plants appear. Among the more 

 characteristic are a lupine {Lupinus lyallii)^ the curious Spracjuea 

 umhellata^ an Eriogonum {E. coryphaeum) ^ Oreastrurn alpigenumy 

 Erigeron aureus^ and Polemonium elegans. 



The above description applies particularly to the Arctic Zone in 

 the Cascade Mountains. The flora of the same zone in the Olympics 

 is very similar, the principal differences being in the flora of the high- 

 est peaks. In the Blue Mountains of Washington the Arctic Zone is 

 very limited in extent. The arctic flora of these last mountains is, 

 hoAvever, about as closely related to that of the Rocky Mountains as 

 to that of the Cascades. 



The following list shows the same comparative data as regards, 

 distribution as were shown for Hudsonian species: 



])ii<trU)utlon of characierii^tw Arctic-AJpine species. 



