Introductory
SPECIES: Alnus incana ssp. tenuifolia | Thinleaf Alder 



ABBREVIATION : 
ALNINCT

SYNONYMS : 
   Alnus tenuifolia
   Alnus tenuifolia var. occidentalis
   Alnus incana ssp. rugosa var. occidentalis


SCS PLANT CODE : 
   ALTE2


COMMON NAMES : 
   thinleaf alder
   thin-leaved alder
   mountain alder
   river alder


TAXONOMY : 
Thinleaf alder is a member of a huge circumboreal complex distributed
throughout much of North America and Europe.  Subtle differences in
botanical characteristics exhibited across this plant's wide geographic
distribution have caused taxonomic disagreement.  Members of the taxon
are universally accepted as Alnus incana (L.) Moench, but disagreement
exists as to the proper classification below the species level.
Currently two classifications which differentiate members of this taxon
exist:

Alnus incana (L.) Moench - Circumboreal distribution
  ssp. incana - Old World plants
  ssp. rugosa (DuRoi) Clausen - New World plants
    var. rugosa - speckled alder - eastern U.S. and Canada 
    var. occidentalis (Dippel) Hitchcock - thinleaf alder - western U.S.
                                                            and Canada
                                                            [22,55] 

And

Alnus incana (L.) Moench - Circumboreal distribution
  ssp. incana - Old World plants
  ssp. rugosa (DuRoi) Clausen - speckled alder - eastern U.S. and Canada
  ssp. tenuifolia (Nuttall) Breitung - thinleaf alder - western U.S. and
                                                        Canada  [12,15,27]

This discussion recognizes the entity Alnus incana ssp. tenuifolia
(Nuttall) Breitung.  


LIFE FORM : 
Tree

FEDERAL LEGAL STATUS : 
No special status

OTHER STATUS : 
NO-ENTRY


COMPILED BY AND DATE : 
Ronald Uchytil, April 1988


LAST REVISED BY AND DATE : 
NO-ENTRY


AUTHORSHIP AND CITATION : 
Uchytal, Ronald J. 1989. Alnus incana ssp. tenuifolia. In: Remainder of Citation

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