DISTRIBUTION AND OCCURRENCE
SPECIES: Thuja plicata | Western Redcedar 



GENERAL DISTRIBUTION : 
Western redcedar occurs along the Pacific Coast from the southern part
of the Alaska Panhandle through British Columbia, western Washington,
and western Oregon, reaching into the coastal redwood forest of northern
California [8,50,54,57].  Inland from the coast it occupies a contiguous
band east of the Cascade Range from central Oregon to southern British
Columbia [54].  Much farther inland a disjunct population occurs along
the west slopes of the Rocky Mountains from Prince George, British
Columbia, to northeastern Washington, northern Idaho, and western
Montana [50,54,57].


ECOSYSTEMS : 
   FRES20  Douglas-fir
   FRES21  Ponderosa pine
   FRES22  Western white pine
   FRES23  Fir - spruce
   FRES24  Hemlock - Sitka spruce
   FRES25  Larch
   FRES26  Lodgepole pine
   FRES27  Redwood
   FRES28  Western hardwoods


STATES : 
     AK  CA  HI  ID  MT  OR  WA  AB  BC


ADMINISTRATIVE UNITS : 
     CODA  GLAC  MORA  NOCA  OLYM  REDW
     SAJH


BLM PHYSIOGRAPHIC REGIONS : 
    1  Northern Pacific Border
    2  Cascade Mountains
    5  Columbia Plateau
    8  Northern Rocky Mountains


KUCHLER PLANT ASSOCIATIONS : 
   K001  Spruce - cedar - hemlock forest
   K002  Cedar - hemlock - Douglas-fir forest
   K003  Silver fir - Douglas-fir forest
   K004  Fir - hemlock forest
   K005  Mixed conifer forest
   K006  Redwood forest
   K012  Douglas-fir forest
   K013  Cedar - hemlock - pine forest
   K014  Grand fir - Douglas-fir forest
   K015  Western spruce - fir forest


SAF COVER TYPES : 
   210  Interior Douglas-fir
   212  Western larch
   213  Grand fir
   215  Western white pine
   218  Lodgepole pine
   221  Red alder
   222  Black cottonwood - willow
   223  Sitka spruce
   224  Western hemlock
   225  Western hemlock - Sitka spruce
   226  Coastal true fir - hemlock
   227  Western redcedar - western hemlock
   228  Western redcedar
   229  Pacific Douglas-fir
   230  Douglas-fir - western hemlock
   231  Port-Orford-cedar
   232  Redwood


SRM (RANGELAND) COVER TYPES : 
NO-ENTRY


HABITAT TYPES AND PLANT COMMUNITIES : 
Western redcedar commonly occurs as a dominant or codominant on
low-elevation moist sites.  In Montana, the western redcedar habitat
type series described by Pfister and others [60] occurs most extensively
in the Swan Valley and Mission Range, extends eastward locally to
Missoula, and forms small riparian stringers along major streams in the
Bitterroot Range west of Hamilton.  Western redcedar occurs as a
riparian dominance type on toe-slope seepages, moist benches, and wet
bottoms adjacent to streams [35].  Daubenmire and Daubenmire [16]
recognized three western redcedar communities in northern Idaho.
Western redcedar/pachistima (Pachistima myrsinites) is an upland
community, while western redcedar/Devil's club (Oplopanax horridum) and
western redcedar/ladyfern (Athyrium felix-femina) occur on bottomlands.
Western redcedar is sometimes found as a codominant with western hemlock
(Tsuga heterophylla) [16,35,60].  Published classifications identifying
western redcedar as a dominant or codominant are as follows:

Oldgrowth forests of the Canadian Rocky Mountains National Parks [3].
Preliminary plant associations of the southern Oregon Cascade Mountain
  Province [11].
Classification and management of riparian and wetland sites in
  northwestern Montana [13].  
Forest habitat types of northern Idaho: a second approximation [15].
Forest Vegetation of eastern Washington and northern Idaho [16].
Fire ecology of Lolo National Forest habitat types [17].
Preliminary forest plant association management guide. Ketchikan area,
  Tongass National Forest [18].
Fire ecology of western Montana forest habitat types [21].
A guide to the interior cedar-hemlock zone, northwestern transitional
  subzone (ICHg), in the Prince Rupert Forest Region, British Columbia
  [33].
Riparian dominance types of Montana [35].
Classification and management of riparian sites in southwest Montana
  [36].
Soil classification as an aid to identifying forest habitat types in
  northern Idaho [54].
Forest habitat types of Montana [60].
Reference material Daubenmire habitat types [77].
Preliminary forest plant associations of the Stikine area, Tongass
  National Forest [78].
A study of the Vegetation of southeastern Washington and adjacent Idaho
  [81].

Related categories for Species: Thuja plicata | Western Redcedar