6) Mixed Deciduous/Conifer Tree Riparian 



This was an advanced stage of successional development having 

 a tree overstory comprised of deciduous trees combined with a 

 conifer canopy coverage of 20 percent or greater. The majority of 

 the conifers consisted of Douglas-fir, hemlock (Tsuga heteropj^ylla) , 

 western larch (l arix occiden talis) , ponderosa pine, spruce, and 

 western redcedai (Thuja plicata) . The extent of this HMU may have 

 been underestimiited due to the difficulty in distinguishing the 

 deciduous trees found within the more dense stands. 



7) Grassland 



This HMU consisted of open areas dominated by a variety of 

 grasses interspersed with a diversity of forbs. This unit included 

 upland parks and meadows, as well as the non-agricultural grass- 

 lands identified within the Tctoacco Plains area. Bluebunch wheat- 

 grass (Agrcpyrcfi spicatum) , rough fescue (Festuca scabrella) , Idaho 

 fescue (F^ idahoensis) and blue grass (Poa spp .) were the dominate 

 grasses . 



8) Upland Shrub 



This HMU included areas dominated by the presence of several 

 species of shrubs, including serviceberry (Amelanchier alnifolia) , 

 bitterbrush (Purshia tridentata) , Rocky Mountain maple (Acer 

 glabrum) , ceanothus (Ceanothus spp.) and snowberry (Symphor icarpos 

 spp.) . These areas were a serai stage of plant succession related 

 to old fires or logged areas. Tree canopy comprised less than an 

 estimated 10 percent of the total canopy coverage for a given map 

 unit. 



9) Warm Dry Conifer Type 



This group was dominated by ponderosa pine anchor Douglas-fir 

 with an understory consisting of conifer reproduction, shrubs, 

 grasses, and forbs associated with drier sites. Ihese sites were 

 usually located on warmer aspects (south- and west-facing) with 

 poor soils and a reduced availability of moisture. This was often 

 a disci imax successional stage containing a more open canopy cover- 

 age. 



10) Cool Dry Douglas-fir Typ e 



This group contained an overstory dominated by Douglas-fir with 

 a less developed understory. This type v/as usually located on warmer 

 aspects; however, the dense Douglas-fir overstory influenced the 

 other plant species associated with this type. 



11) Cool, Moist Douglas-fir Type 



This group was located on the cooler slopes (north and ease) 

 and contained an overstory dominated by Douglas-fir and an under- 



