Table B2 . — (continued) 



8. Muhlenbergia cuspidata v/ell represented 

 PSEl-IEN/MUHCUS 



8. Muhlenbergia cuspidata poorly represented or absent -- 9 



9. Juniperus scopulorum well represented 



PSEMEN/JUNSCO 



9. Juniperus scopulorum poorly represented or absent — 10 



10. Symphoricarpos occidentalis well represented 



PSEMEN/SYMOCC 

 10. Symphoricarpos occidentalis poorly represented or absent; Pseu- 

 doroegneria spicata the dominant undergrowth 

 PSEMEN/PSESPI 



Key to the Pinus contorta Communities 



1. Linnaea borealis common 



PINCON/LINBOR 

 1. Linnaea borealis scarce or absent; Juniperus communis or Arcto- 

 staphylos uva-ursi the dominant undergrowth 



PINCON/JUNCOM 



Key to the Pinus ponderosa Communities 



1. Amelanchier alnifolia v;ell represented 

 PINPON/AMEALN 



1. Amelanchier alnifolia poorly represented or absent — 2 



2. Arctostaphylos uva-ursi well represented 



PINPON/ARCUVA 



2. Arctostaphylos uva-ursi poorly represented or absent — 3 



3. Mahonia repens well represented 



PINPON/MAHREP 



3. Mahonia repens poorly represented or absent -- 4 



4. Juniperus scopulorum well represented 



PINPON/JUNSCO 



4. Juniperus scopulorum poorly represented or absent — 5 



5. Symphoricarpos occidentalis well represented 



PINPON/SYMOCC 



5. Symphoricarpos occidentalis poorly represented or absent — 6 



6. Graminoids well represented — 7 



6. Graminoids poorly represented or absent; Juniperus horizontalis 

 or Rhus trilobata common 

 PINPON/JUNHOR 



42 



