DISTRIBUTION AND OCCURRENCE
SPECIES: Alnus rhombifolia | White Alder 



GENERAL DISTRIBUTION : 
White alder is distributed from the Pacific coast of Baja California,
north in the coastal valleys to just north of San Francisco Bay, in the
interior foothills of the Coast Ranges and low to mid elevation slopes
of the Sierra Nevada.  It is found farther north along the lower eastern
slopes of the Cascades in Oregon and Washington and in the dry interior
valleys of Oregon, extending into southern British Columbia.  It extends
eastward along the main tributaries of the Columbia River to the lower
valleys of southeastern and south-central Washington, and northeastern
Oregon, reaching its eastern limits in Idaho along the Clearwater and
Snake Rivers [22].


ECOSYSTEMS : 
   FRES20  Douglas-fir
   FRES21  Ponderosa pine
   FRES27  Redwood
   FRES28  Western hardwoods
   FRES29  Sagebrush
   FRES34  Chaparral - mountain shrub
   FRES35  Pinyon - juniper
   FRES41  Wet grasslands
   FRES42  Annual grasslands


STATES : 
     CA  ID  NV  OR  WA  BC


ADMINISTRATIVE UNITS : 
     CODA  JODA  KICA  SAMO  SEQU  WHIS
     YOSE


BLM PHYSIOGRAPHIC REGIONS : 
    1  Northern Pacific Border
    2  Cascade Mountains
    3  Southern Pacific Border
    4  Sierra Mountains
    5  Columbia Plateau
    6  Upper Basin and Range
    8  Northern Rocky Mountains


KUCHLER PLANT ASSOCIATIONS : 
   K005  Mixed conifer forest
   K006  Redwood forest
   K011  Western ponderosa forest
   K024  Juniper steppe woodland
   K025  Alder - ash forest
   K026  Oregon oakwoods
   K029  California mixed evergreen forest
   K030  California oakwoods
   K033  Chaparral
   K048  California steppe
   K055  Sagebrush steppe


SAF COVER TYPES : 
   211 White fir
   221  Red alder
   222  Black cottonwood - willow
   229  Pacific Douglas-fir
   232  Redwood
   234  Douglas-fir - tanoak - Pacific madrone
   239  Pinyon - juniper woodlands
   243  Sierra Nevada mixed conifer
   244  Pacific ponderosa pine - Douglas-fir
   245  Pacific ponderosa pine
   247  Jeffrey pine
   248  Knobcone pine
   249  Canyon live oak
   255  California coast live oak


SRM (RANGELAND) COVER TYPES : 
NO-ENTRY


HABITAT TYPES AND PLANT COMMUNITIES : 
White alder is restricted to riparian woodland communities.  In these
communities it is often found with Fremont cottonwood (Populus
fremontii), California sycamore (Platanus racemosa), willows (Salix
spp.), ash (Fraxinus spp.), California live oak (Quercus agrifolia),
valley oak (Q. lobata), and Douglas-fir (Pseudotsuga menziesii)
[2,30,31,39].

Plublished classification schemes listing white alder as a dominant part
of the vegetation in community types (cts), habitat types (hts), or
plant associations (pas) are presented below:

   Area                    Classification             Authority

CA                  hardwood forest&woodland cts   Barbour 1987

s CA                general veg. pas               Paysen & others 1980

CA:San Gabriel Mts  general veg. cts               Hanes 1976

CA:Santa Ana&San    general veg. cts               Vogl 1976
 Jacinto Mts    

CA:San Bernardino   general veg. cts               Minnich 1976
 Mts

sw USA              wetland cts                    Brown 1979

e Wa,nID            steppe hts                     Daubenmire 1970

Related categories for Species: Alnus rhombifolia | White Alder