DISTRIBUTION AND OCCURRENCE
SPECIES: Philadelphus lewisii | Lewis' Mockorange 



GENERAL DISTRIBUTION : 
Lewis' mockorange occurs in the northwestern United States and southern
Canada.  It occurs from extreme southern British Columbia south to
California, and east to north and central Idaho, western Montana, and
southwestern Alberta [14,15,34].  Philadelphus lewisii ssp. californicus
occurs from the southern Cascade Range of southwestern Oregon south
through the Sierra Nevada to Tulare County, California [14,32], and P.
l. var. gordonianus occurs in the Coast Ranges and the Cascade Range
from British Columbia south to northern California [43].


ECOSYSTEMS : 
   FRES20  Douglas-fir
   FRES21  Ponderosa pine
   FRES22  Western white pine
   FRES23  Fir-spruce
   FRES25  Larch
   FRES28  Western hardwoods
   FRES29  Sagebrush
   FRES34  Chaparral-mountain shrub
   FRES36  Mountain grasslands


STATES : 
     CA  ID  MT  OR  WA  AB  BC


ADMINISTRATIVE UNITS : 
     CODA  CRLA  CRMO  GLAC  JODA  MORA
     NEPE  NOCA  OLYM  ORCA  REDW  SAJH
     SEKI  WHSH  YOSE


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


KUCHLER PLANT ASSOCIATIONS : 
   K010  Ponderosa shrub forest
   K011  Western ponderosa forest
   K012  Douglas-fir forest
   K013  Cedar-hemlock-pine forest
   K014  Grand fir-Douglas-fir forest
   K025  Alder-ash forest
   K026  Oregon oakwoods
   K028  Mosaic of K002 and K026
   K034  Montane chaparral
   K051  Wheatgrass-bluegrass
   K055  Sagebrush steppe


SAF COVER TYPES : 
   210  Interior Douglas-fir
   212  Western larch
   213  Grand fir
   219  Limber pine
   221  Red alder
   222  Black cottonwood-willow
   227  Western redcedar-western hemlock
   229  Pacific Douglas-fir
   230  Douglas-fir-western hemlock
   233  Oregon white oak
   234  Douglas-fir-tanoak-Pacific madrone
   237  Interior ponderosa pine
   244  Pacific ponderosa pine-Douglas-fir
   245  Pacific ponderosa pine


SRM (RANGELAND) COVER TYPES : 
   109  Ponderosa pine shrubland
   203  Riparian woodland
   209  Montane shrubland
   421  Chokecherry-serviceberry-rose
   422  Riparian


HABITAT TYPES AND PLANT COMMUNITIES : 
Lewis' mockorange commonly occurs in open coniferous forests and at
forest edges [34], and is usually associated with other shrubs.  In dry
Douglas-fir (Pseudotsuga menziesii) forests on the western slope of the
Cascade Range in Oregon, Lewis' mockorange is positively (significant at
P<0.05) associated with beaked hazelnut (Corylus cornuta), oceanspray
(Holodiscus discolor), poison-oak (Toxicodendron diversilobum), baldhip
rose (Rosa gymnocarpa), and hollyleaved barberry (Mahonia aquifolium).
It reaches its greatest importance in the Douglas-fir/hollyleaved
barberry/disporum (Disporum spp.) community type [26].  Lewis'
mockorange is positively (significant at P<0.05) associated with
ninebark (Physocarpus malvaceus) on talus slopes in western Montana [25].

Lewis' mockorange occurs in moist draws and riparian areas, especially
in drier regions of the Northwest.  In eastern Oregon, Lewis' mockorange
is associated with willows (Salix spp.), alders (Alnus spp.), and
hawthorns (Crataegus spp.) [13].  It occurs with red-osier dogwood
(Cornus sericea) and Saskatoon serviceberry (Amelanchier alnifolia) in
north-central Washington [6].  It occurs with Saskatoon serviceberry and
common chokecherry (Prunus virginiana) on rocky outcrops of the National
Bison Range in western Montana [29].  In Oregon white oak (Quercus
garryana) woodlands in northern California, Lewis' mockorange occurs
along stream channels with oceanspray, cluster rose (R. pisocarpa), pale
serviceberry (A. pallida), and Indian plum (Oemleria cerasiformis).  A
Lewis' mockorange/brittle bladderfern (Cystopteris fragilis) community
type has been described [41].

Lewis' mockorange occurs in seral shrubfields and chaparral communities.
In northern Idaho, Lewis' mockorange is a component of the tall shrub
union that follows logging and burning [48].  In southwestern Oregon,
Philadelphus lewisii ssp. californicus occurs in chaparral dominated by
wedgeleaf ceanothus (Ceanothus cuneatus).  Other shrubs present include
skunkbush sumac (Rhus trilobata), yerba santa (Eriodictylon
californicum), chaparral honeysuckle (Lonicera interrupta), Klamath plum
(P. subcordata), hollyleaf redberry (Rhamnus crocea ssp. ilicifolia),
and pale serviceberry [7].

Related categories for Species: Philadelphus lewisii | Lewis' Mockorange