Vol. IX) HALL & GRINN ELL— LIFE-ZONE INDICATORS 65 



HUDSONIAN ZONE— Continued 



Macronema suffruticosa Nutt. A 

 Stenotus acaulis Nutt. C 



Amphibians 

 Spelerpes platycephalus Camp 



Birds 



Picoides arcticus (Swainson) 

 Nucifraga columbiana (Wilson) C 

 Pinicola enucleator californica Price 

 Zonotrichia leucophrys (Forster) 

 Hylocichla guttata polionota Grinnell C 



Mammals 



Gulo luscus luteus Elliot 



Citellus beldingi (Merriam) 



Eutamias alpinus (Merriam) 



Ochotona schisticeps schisticeps (Merriam) 



Ochotona schisticeps muiri Grinnell & Storer C A 



Ochotona schisticeps albatus Grinnell A 



Ovis canadensis sierrse Grinnell C 



ARCTIC-ALPINE ZONE 



Species marked H occur also in the Hudsonian Zone. 



Plants 



Trisetum congdonii Scribn. & Merr. 

 Carex breweri Boott 

 Salix arctica petrsea Anders. 

 Oxyria digyna Camptd. H 

 Lewisia pygmaea (Gray) Rob. H 

 Ranunculus eschscholtzii Schlect. 

 Draba breweri Wats. 

 Saxifraga tolmiei T. & G. H 

 Horkelia pygmaea (Gray) Rydb. 

 Sibbaldia procumbens Linn. H 



