Table 3. (Con.) 



15. Carex geyeri, Carex rossii. and Stipa occidentalis (alone or in 



combination) conspicuous with at least 5% canopy cover Populus tremuloides/Symphoricarpos oreophilus/ 



Carex geyeri c.t. (p. 17) 

 15. Not as above 16 



16. Sitanion hystrix, Stipa comata, and Stipa lettermanii (alone 

 or in combination) conspicuous w/ith at least 5% canopy 



cover Populus tremuloides/Juniperus communis/Sitanion 



hystrix c.t. (p. 20) 



16. Above grasses usually absent; less than 5% cover if 



present 17 



17. Bromus carinatus and/or Elymus glaucus a conspicuous part of 



the herbaceous layer, usually with more than 5% cover Populus tremuloides/Symphoricarpos oreophilus/ 



Bromus carinatus c.t. (p. 20) 

 17. S. carinatus and E. glaucus absent or scarce 18 



18. Poa pratensis and Taraxacum officinale among the most 



prominent perennials in the herbaceous layer Populus tremuloides/Symphoricarpos oreophilus/Poa 



pratensis c.t. (p. 21 ) 



18. Not as above Unclassified type 



AC. (Herb undergrowth type) 



1. Veratrum californicum prominent, generally exceeding 5% 



canopy cover Populus tremuloides/Veratrum californicum c.t. 



(p. 22) 



1. V. californicum generally absent; if present, less than 5% 

 ' . canopy cover 2 



2. Pteridium aquilinum usually abundant, with at least 10% 



canopy cover Populus tremuloides/Pteridium aquilinum c.t. 



(p. 23) 



2. P. aquilinum usually absent; if present, then less than 10% 

 cover 3 



3. Heracleum lanatum a conspicuous part of the herbaceous layer 



with usually more than 5% canopy cover Populus tremuloides/Heracleum lanatum c.t. 



(p. 22) 



3. H. lanatum absent or present in only trace amounts 4 



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

 ent, alone or in combination forming a conspicuous part of 



the herbaceous layer Populus tremuloides/Senecio serra c.t. (p. 24) 



4. Members of the tall forb group either absent or in total 



occur in trace amounts 5 



5. Festuca thurberi present with at least 2% canopy cover Populus tremuloides/Festuca thurberi c.t. (p 27) 



5. F. thurberi usually absent; if present, then less than 2% cover 6 



6. Sitanion hystrix and/or Stipa comata conspicuous with at 



least 5% canopy cover Populus tremuloides/Sitanion hystrix c.t. (p. 28) 



6. S. hystrix and S. comata usually absent; if present, less 



than 5% cover 7 



7. Carex geyeri, Carex rosii, Carex obtusata, Stipa occidentalis, or 

 Calamagrostis rubescens (alone or in combination) conspicuous 



with at least 5% cover; Astragalus miser often abundant Populus tremuloides/Carex geyeri c.t. (p. 26) 



7. Not as above 8 



'8. Bromus carinatus and/or Elymus glaucus abundant, usually 



with at least 10% canopy cover Populus tremuloides/Bromus carinatus c.t. (p. 28) 



8. Not as above 9 



9. Poa pratensis and/or Taraxacum officinale among the most 



prominent perennials in the herbaceous layer Populus tremuloides/Poa pratensis c.t. (p. 29) 



9. Not as above Unclassified type 



B. (Populus tremuloldes-Abies lasiocarpa cover type) 



1. Amelanchier ainifolia. Prunus virginiana. or Acer grandidentatum 

 prominent, alone or in combination usually having at least 10% 



canopy cover; members of the tall forb group usually present . . Populus tremuloides-Abies lasiocarpa/Amelanchier 



ainifolia c.t. (p. 3i) 

 1. Not as above 2 



2. Vaccinium caespitosum or Vaccinium scoparium abundant, 



usually well over 10% cover Populus tremuloides-Abies lasiocarpa/ Vaccinium 



caespitosum c.t. (p. 30) ^i^qp ^ 



11 



