66 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Transition species ascend even to the Hudsonian zone, producing thus 
a strange mixture of lowland and subalpine plants. 
From the isolated position of these mountains together with their 
considerable elevation, some peculiarities would naturally be presup- 
posed. The flora is, however, exceedingly similar to that of the 
Cascade Mountains. One misses, to be sure, a few conspicuous Cas- 
cade inhabitants, such as Savifraga tolmie?, Lupinus lyallii, Gentiana 
calycosa, and Fucephalus ledophyllus, 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 paucicapitatus. Senecio flettii. 
Campanula piperi. Spiraea hendersoni. 
Epilobium mirabile. Synthyris pinnatifida tomen- 
Erysimum arenicola. tosa. 
Polemonium amoenwmn. 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 Olympies. 
Synthyris pinnatifida tomentosa likewise has no close relative ex- 
cept in the Wasatch and Rocky Mountains. 
Thermopsis montana, collected in Chehalis 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 boreale, a very abundant species in the Olympies, is 
not known 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 //, 
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. 
