140 ERYTHEA. 



18. Lupinus ornatus Dougl. 



19. Carex. 



The first eight of the above list were found only above 

 timber line and so constitute the true alpine flora of the 

 mountain. 



1. Bryanihus empetriformis Gray, belongs to an arctic 

 genus represented in few species through Alaska, Greenland, 

 Labrador, Northern Europe, eastern side of BehringSea, the 

 White Mountains and the Sierra Nevada Mountains. 



2. Polygonum Shastense Brewer, is much more closely 

 allied to Polygonum Paronychia Ch. & Schl. which flourishes 

 along the coast from Santa Cruz to Vancouver Island than to 

 the arctic species P. Bisioria L. and P. viviparum L. found 

 generally throughout arctic-alpine regions. 



3. Dicentra uniflova Kell. is the only member of this 

 genus that braves the alpine cold. The genus Dicenira pre- 

 fers cool, moist, shady situations. Besides the North Ameri- 

 can species, there are six in Western Asia and the Himalayas. 



4. Silene Grayi Watson is quite unlike the low mossy 

 Silene acaulis L. which so beautifully carpets alpine mead- 

 ows and slopes in the Kocky Mountains. There are however 

 several other arctic-alpine species; but this is more closely 

 allied to Pacific Coast species than to those usually growing 

 near perpetual snow. 



5. Sibbaldia procumhens L. is a true arctic-alpine species, 

 the only cosmopolitan reported from Mt. Shasta. It is found 

 throughout Europe on all the high mountains; in the Arctic 

 regions of both hemispheres ; and in North America on all 

 the high mountains as far south as the San Francisco Moun- 

 tains in Arizona. 



6. Hulsea nana Gray. The genus Hulsea is peculiar to 

 the Sierra Nevada system of mountains and ranges from 

 Washington to Lower California. It belongs to the Bahia 

 group and has for its nearest relatives plants of undoubted 

 Sonoran origin, sach as Choeiiactis, Floresiina and Tricliop- 

 tilium. 



7. Castilleia pallida Kunth var. occidentalis Gray differs 



