Table 3. (Con.) 



AB. (Low shrub undergrowth type) 



1. Sambucus racemosa and/or Sambucus cerulea conspicuous 



with at least 5% canopy cover Populus tremuloides/Sambucus racemosa c.t. 



(p. 15) 



I. S. racemosa and S. cerulea usually absent: if present, then less 

 than 5% cover 2 



2. Juniperus communis generally exceeding 5% canopy cover 3 

 2. J. communis absent or scarce, less than 5% cover 8 



3. Festuca tliurberi conspicuous with at least 5% cover: 



Symphoricarpos oreophilus usually present Populus tremuloides/Symphoricarpos 



oreoptiilus/Festuca thurberi c.t. ( p. 18) 



3. F. thurberi usually absent: if present, less than 5% canopy 



cover 4 



4. Carex geyeri, Carex rossii. or Stipa occidentalis (alone or in 

 combination) conspicuous, usually with at least 5% canopy 



cover Populus tremuloides/Juniperus communis/ 



Carex geyeri c.t. (p. 18) 

 4. Not as above 5 



5. Sitanion hystrix. Stipa comata, and Stipa lettermanii (alone or in 

 combination) conspicuous, usually at least 5% total canopy 



cover Populus tremuloides/Juniperus communis/Sitanion 



hystrix c.t. (p. 20 ) 



5. Not as above 6 



6. Astragalus miser prominent with at least 10% canopy 



cover Populus tremuloides/Juniperus communis/ 



Astragalus miser c.t. (p. 21) 



6. A. miser absent, or forming only an incidental part of the 



herbaceous layer 7 



7. Poa pratensis and Symphoricarpos oreophilus prominent, each 



with at least 10% cover Populus tremuloides/Symphoricarpos 



oreophilus/Poa pratensis c.t. (p. 21 ) 

 7. Not as above Unclassified type . 



8. Symphoricarpos oreophilus prominent, at least 10% canopy 



cover 13 



8. S. oreophilus absent or scarce, less than 10% cover 9 



9. Artemisia tridentata present with at least 5% cover 10 



9. A. tridentata absent or scarce Go to AC 



10. Carex geyeri, Carex rossii. and/or Stipa occidentalis (alone 

 or in combination) conspicious with at least 5% canopy 



cover Populus tremuloides/Juniperus communis/Carex 



geyeri c.t. (p. 18) 



10. Not as above '. . . . 11 



II. Sitanion hystrix. Stipa comata. and/or Stipa lettermanii (alone or 

 in combination) conspicuous usually with at least 5% canopy 



cover Populus tremuloides/Juniperus communis/Sitanion 



hystrix c.t. (p. 20\ 



11. Above-named grasses absent or present only in trace amounts 12 



12. Astragalus m/sef abundant, usually with at least 10% 



cover Populus tremuloides/Juniperus communis/ 



Astragalus miser c.t. (p. 21) 



12. A. miser absent, or comprising only an incidental part of the 



herbaceous layer Unclassified type 



13. Festuca thurberi conspicuous with at least 5% canopy cover . . Populus tremuloides/Symphoricarpos oreophilus/ 



Festuca thurberi c.t. (p. 18) 



13. F. thurberi generally absent: if present, less than 5% canopy 



cover 14 



14. One or more members of the tall forb group readily appar- 

 ent, alone or in combination usually forming a conspicuous 



part of the herbaceous layer Populus tremuloides/Symphoricarpos oreophilus/ 



Senecio serra c.t. (p. 16) 



14. Members of the tall forb group absent or in total occur in 



only trace amounts 15 



(con.) 



10 



