DISTRIBUTION AND OCCURRENCE
SPECIES: Alnus incana ssp. tenuifolia | Thinleaf Alder 



GENERAL DISTRIBUTION : 
Thinleaf alder is the most widely distributed alder in western North
America and is the most common alder of the Rocky Mountains, the Sierra
Nevada, and the east side of the Cascades [53].  It is found on a wide
variety of sites, from near sea level to nearly 10,000 feet (3,048 m) in
Arizona, Colorado, and New Mexico [25].  Thinleaf alder is found from
central Alaska and the Yukon Territory, southeast to western
Saskatchewan and British Columbia, and south throughout the Mountain
States to New Mexico and California [34].  Throughout much of
Saskatchewan, the ranges of thinleaf alder and speckled alder (Alnus
incana ssp. rugosa) overlap, with plants in this region exhibiting
intermediate botanical characteristics [24].  Thinleaf alder seldom
overlaps with red alder (Alnus rubra) habitat and probably never
overlaps with white alder (A. rhombifolia) [25].


ECOSYSTEMS : 
   FRES20  Douglas-fir
   FRES21  Ponderosa pine
   FRES23  Fir - spruce
   FRES26  Lodgepole pine
   FRES29  Sagebrush
   FRES34  Chaparral - mountain shrub


STATES : 
     AK  AZ  CA  CO  ID  MT  NV  NM  OR  UT
     WA  WY  AB  BC  MB  SK  YT


ADMINISTRATIVE UNITS : 
     BAND  CARE  CODA  CRLA  FLFO  GLAC
     GRCA  GRSA  LACL  LAVO  ROMO  SAGU
     TICA  WHIS  WRST  YELL  YOSE  YUCH


BLM PHYSIOGRAPHIC REGIONS : 
    2  Cascade Mountains
    4  Sierra Mountains
    5  Columbia Plateau
    6  Upper Basin and Range
    8  Northern Rocky Mountains
    9  Middle Rocky Mountains
   10  Wyoming Basin
   11  Southern Rocky Mountains
   12  Colorado Plateau
   13  Rocky Mountain Piedmont


KUCHLER PLANT ASSOCIATIONS : 
   K005  Mixed conifer forest
   K007  Red fir forest
   K011  Western ponderosa forest
   K012  Douglas-fir forest
   K013  Cedar - hemlock - pine forest
   K014  Grand fir - Douglas-fir forest
   K018  Pine - Douglas-fir forest
   K019  Arizona pine forest
   K020  Spruce - fir - Douglas-fir forest
   K021  Southwestern spruce - fir forest
   K023  Juniper - pinyon woodland
   K037  Mountain mahogany - oak scrub
   K038  Great Basin sagebrush
   K055  Sagebrush steppe


SAF COVER TYPES : 
   201  White spruce
   203  Balsam poplar
   204  Black spruce
   207  Red fir
   210  Interior Douglas-fir
   211  White fir
   213  Grand fir
   215  Western white pine
   216  Blue spruce
   217  Aspen
   218  Lodgepole pine
   229  Pacific Douglas-fir
   230  Douglas-fir - western hemlock
   235  Cottonwood - willow
   237  Interior ponderosa pine
   243  Sierra Nevada mixed conifer
   244  Pacific ponderosa pine - Douglas-fir
   245  Pacific ponderosa pine


SRM (RANGELAND) COVER TYPES : 
NO-ENTRY


HABITAT TYPES AND PLANT COMMUNITIES : 
Thinleaf alder typically forms narrow bands along midelevation streams
and rivers, or around springs of moist mountain slopes [17,31,41].
Adjacent upland communities are typically dominated by coniferous
forests or big sagebrush (Artemisia tridentata) [17,41,58].

Published classification schemes listing thinleaf alder as an indicator
species or as a dominant part of the vegetation in community types
(cts), habitat types (hts), plant associations (pas), riparian zone
associations (rzas), dominance types (dts), or riparian site types (rst)
are presented below:

   Area                Classification                 Authority

FS Region 2:WY,      general veg. pas             Johnston 1987
 SD,NE,CO,KS
FS Region 2:WY,      general veg. hts             Wasser & Hess 1982
 SD,NE,CO,KS
MT                   riparian veg. dts            Hansen & others 1988
sw MT                riparian veg. rst, hts, cts  Hansen & others 1988
ne OR                riparian cts                 Kauffman & others 1985
e OR,se WA:Blue Mt   general veg. cts             Hall 1973
OR:Deschutes,Ochoco, riparian veg. rzas, cts      Kovalchik 1987
 Fremont&Winema NF's 
e ID,w WY            riparian veg. cts            Youngblood & others
                                                  1985a 
n UT,ID              riparian veg. cts            Youngblood & others
                                                  1985b
s UT                 riparian veg. cts            Padgett & Youngblood
                                                  1986
Crater Lake NP       general veg. hts, cts        McNeil 1975
se WY:Medicine Bow   forest veg. hts, cts         Wirsing & Alexander
 NF                                               1975
se WY:Medicine Bow   forest veg. hts, cts         Alexander & others
 NF                                               1986
CO:Gunnison &        general veg. hts             Komarkova 1986
 Uncompahgre NF's                                  
AB,Canada:Peace-     general veg. cts             Dirschl & others 1974
 Athabaska Delta

Related categories for Species: Alnus incana ssp. tenuifolia | Thinleaf Alder