66 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Transition species ascend even to the Hudsonian zone, producing thus 

 a strange mixture of lowhind and subalpine phmts. 



From the isohited position of these mountains together with their 

 considerable elevation, some peculiarities would naturally bo presup- 

 posed. Tl^ flora is, however, exceeding^ similar to that of the 

 Cascade INIountains. One misses, to be sure, a few conspicuous Cas- 

 cade inhabitants, such as Saxifraga tolmiei^ Lupinus lyallih (rentiana 

 calycosa,, and Eurephalus JedophyUus^ but the great majority of the 

 plants are the same as those of the Cascades. The species which are 

 not of the Cascade Mountains present, however, some interesting 

 problems. Up to the present time there are only about ten species 

 known to be peculiar to the Olympics, and these are all species of 

 high altitude and most of them abundant as to individuals. They 

 are as follows : 



Aster paucirapitatus. Scnrcio flettii. 



Cauipauiila pipcrl. Spiraea heiidersntii. 



Epilnhium inirabilc. Syiithi/ris pinnatlflda tomen- 

 EryHimmn areninAa. tot<a. 



Polemonium amoenum. Viola flettii. 



Campanula piperi is nearly related to an Alaskan species. The 

 others have their nearest relatives in Cascade and Sierra forms. 



Some few species have a strangely isolated station in the Olympics. 

 Phaca hookeriana^ a species of the mountains of northern California 

 and adjacent Nevada, also occurs in the Blue Mountains and then, 

 apparently vaulting the Cascades, reappears in the Olympics. 



Synthyris pinnutifida tomentosa likewise has no close relative ex- 

 cept in the Wasatch and Rocky ^lountains. 



Thermopsis wontana^ collected in Chphalis County, is not other- 

 wise known west of the eastern border of Washington. 



Therofon majus intermedium is a subspecies whose parent species 

 occurs in southeastern Oregon and California, and strangely enough 

 reappears in abundance in the Bitterroots, though unknown in the 

 Blue Mountains. 



Hedysarum horeale^ a very abundant species in the Olympics, is 

 not know^n from the Cascades at all, though occurring in the north- 

 ern Rockies and eastward to New" England. In the northern Cas- 

 cades and in the Bitterroots appears the closely related species H. 

 sulphurescens. 



Heuchera racemosa is an abundant species in the higher Olympics. 

 Otherwise it is a very rare plant, on Mount Adams and on Mount 

 Rainier. 



Further explorations of these mountains are likely to disclose 

 other peculiar species. These should be sought especially on the 

 highest peaks. 



