DISTRIBUTION AND OCCURRENCE
SPECIES: Spiraea douglasii | Douglas' Spirea 



GENERAL DISTRIBUTION : 
Douglas' spirea occurs from Alaska south to northern California and east
to western Montana [21,29,35].  Pyramid spirea occurs from British
Columbia south to Oregon and east to western Montana [35].


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


STATES : 
     AK  CA  ID  MT  OR  WA  BC


ADMINISTRATIVE UNITS : 
     CODA  CRLA  FOCL  MORA  MOSA  NOCA
     OLYM


BLM PHYSIOGRAPHIC REGIONS : 
    1  Northern Pacific Border
    2  Cascade Mountains
    4  Sierra 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
   K007  Red fir forest
   K010  Ponderosa shrub forest
   K011  Western ponderosa forest
   K012  Douglas-fir forest
   K013  Cedar-hemlock-pine forest
   K025  Alder-ash forest
   K026  Oregon oakwoods
   K028  Mosaic of K002 and K026


SAF COVER TYPES : 
   205  Mountain hemlock
   206  Engelmann spruce-subalpine fir
   207  Red fir
   210  Interior Douglas-fir
   211  White fir
   215  Western white pine
   217  Aspen
   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
   232  Redwood
   233  Oregon white oak
   237  Interior ponderosa pine


SRM (RANGELAND) COVER TYPES : 
   203  Riparian woodland
   422  Riparian


HABITAT TYPES AND PLANT COMMUNITIES : 
Douglas' spirea occurs mainly in riparian habitats such as swamps, mud
flats, shrub carrs, marshes, bogs, and along streams [8,17,18,23,44].

In British Columbia Douglas' spirea is found in rush (Juncus spp.)-sedge
(Carex spp.)-quillwort (Isoetes spp.) and shrub carr community types
[8,18].  Common associates include Rocky Mountain maple (Acer glabrum),
Sitka willow (Salix sitchensis), salmonberry (Rubus spectabilis), salal
(Gaultheria shallon), sweet gale (Myrica gale), and bog rush (Juncus
effusus) [2,28].

In Washington a Douglas' spirea-bog blueberry (Vaccinium
uliginosum)/sedge community type is described.  Common associates
include swordleaf rush (Juncus ensifolius), blister sedge (Carex
vesicaria), Sitka sedge (C. sitchensis), slough sedge (C. obnupta),
common willowweed (Epilobium glandulosum), and kneeling angelica
(Angelica genuflexa) [19].  Douglas' spirea is also a member of a field
horsetail (Equisetum arvense)-skunkcabbage (Veratrum californicum) swamp
association.  Associates include Sitka alder (Alnus viridis ssp.
sinuata), black twinberry (Lonicera involucrata), and red-osier dogwood
(Cornus sericea) [16].  

Associates of Douglas' spirea in Washington and Oregon forest commuities
include dwarf huckleberry (Vaccinium caespitosum), blue wildrye (Elymus
glaucus), deer fern (Blechnum spicant), bracken fern (Pteridium
aquilinum), western yarrow (Achillea millefolium), widefruit sedge
(Carex eurycarpa), Wood's rose (Rosa woodsii), and bristly black currant
(Ribes lacustre) [12,29,30].

In California Douglas' spirea occurs in sphagnum bog, north coast
riparian scrub, and freshwater marsh communities [23,44].  Common
associates include bigleaf maple (Acer macrophyllum), Pacific wax-myrtle
(Myrica californica), Hooker willow (Salix hookeriana), Hinds willow (S.
hindsiana), sedge (Carex spp.), bear sedge (C. arcta), round-leaved
sundew (Drosera rotundifolia), and coast Labrador tea (Ledum glandulosum
var. columbiana) [23,44].  

In eastern Idaho and western Montana, Douglas' spirea is dominant in
herbaceous wetland communities [41,42].  In Montana a Douglas' spirea
community type has been described [4,17].  Douglas' spirea is dominant
in a thinleaf alder community type [4].  Common associates in Montana
include Booth willow (Salix boothii), Geyer willow (S. geyeriana),
Wood's rose, western polemonium (Polemonium occidentale), beaked sedge
(Carex rostrata), inflated sedge (C. vesicaria), reed canarygrass
(Phalaris arundinacea), and creeping bentgrass (Agrostis stolonifera)
[4,17].  

The following publications list Douglas' spirea as a community dominant:

Classification and management of riparian and wetland sites in
  northwestern Montana [4]
Riparian dominance types of Montana [17]
Plant association and management guide: Willamette National Forest [19]
Riparian zone associations: Deschutes, Ochoco, Fremont, and Winema
  National Forests [29]
Classification of aquatic and semiaquatic wetland natural areas in Idaho
  and western Montana [41]
Management of riparian vegetation in the northcoast region of
  California's coastal zone [44]

Related categories for Species: Spiraea douglasii | Douglas' Spirea