Rydberg: Phytogeographical notes 359 



Phacelia alpina \Castilleja Tweedy i 



t " Lyallii t " pulchella 



Mertensia stenoloba ^Pedicidaris ctenophora 



t " Ticeedyi f " cystopteridijolia 



Pentstemon Lyallii Oreostemma Haydeni 



t " montanus ^Erigeron radical us 



" arid us Hulsea carnosa 



" pseudohumilus Senecio sphaerocephalus 



" Tweed yi f " alpicola 



Synthyris laciniata " megacephalus 



" dissecta 



Some of these endemics of the Northern Rockies extend south 

 into the Wasatch Mountains of Utah. As I have already stated, 

 the exchange of species between the Northern and Southern 

 Rockies does not take place along the continental divide in Wy- 

 oming, but between the Wasatch and Teton Mountains, through 

 the Bear River Mountains in southeastern Idaho. This exchange 

 is more evident in the Montane Zone, but the following northern 

 endemics have crossed the line and their range extends into Utah: 



Eriogomim heracleoides Angelica Roseana 



Arabis oreophila Vaccinium glohulare 



Anemone tetonensis Polemonium viscosum 



Potentilla Macoiinii Collomia dehilis 



Ligiisticum filicinum Synthyris laciniata 



A few of the northern endemics extend eastwards into the 

 Black Hills of South Dakota such as: 

 Atelephragma Forwoodii Epilobium saximontanum 



4. Endemic species restricted to the Southern Rockies 



The endemics are more numerous in the Southern Rockies 

 than in the Northern. The more widely distributed are the 

 following: 



Shrubs 



Salix pseudolapponum Kibes Wolfii 



" Wolfii Sambucus microbotrys 



Ribes coloradensis 



