RYDBERG: PHYTOGEOGRAPHICAL NOTES 359 
Phacelia alpina {Castilleja Tweedyi 
“ Lyallin 1 " . -putchella 
Mertensia stenoloba {Pedicularis ctenophora 
SS ah Tweedyi eS _ cystopteridifolia 
Pentstemon Lyallia Oreostemma Haydent 
montanus tErigeron radicatus 
Mi aridus Hulsea carnosa 
x pseudohumilus Senecio sphaerocephalus 
¥ Tweedyi © t “ ‘alptcola 
Synthyris laciniata ‘“  megacephalus 
ys bisstcke. 
‘ 
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: 
Eriogonum heracleoides Angelica Roseana 
Arabis oreophila Vaccinium globulare 
Anemone tetonensis Polemonium viscosum 
Potentilla Macounit Collomia debtlis 
Ligusticum filicinum Synthyris laciniata 
A few of the northern endemics extend eastwards into the 
Black Hills of South Dakota such as: oe 
Atelephragma Forwoodt 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 Ribes Wolfit 
‘Wolfs Sambucus microbotrys 
Ribes coloradensis 
