Alnus Incana - Subspecies

Subspecies

There are four to six subspecies, some treated as separate species by some authors:

• Alnus incana subsp. incana (Grey Alder). Northern Europe and northwestern Asia, and central and southern Europe in mountains, mainly in the regions of the Alps, Carpathians and the Caucasus.
• Alnus incana subsp. hirsuta (Spach) Á. & D.Löve (=A. hirsuta Spach; Manchurian Alder). Northeastern Asia, and central Asia in mountains.
• Alnus incana subsp. kolaensis (N.I.Orlova) Á. & D.Löve. Subarctic northeast Europe.
• Alnus incana subsp. oblongifolia (=A. oblongifolia; Arizona Alder). Southwestern North America.
• Alnus incana subsp. rugosa (Du Roi) R.T.Clausen (=A. rugosa Du Roi; Speckled Alder). Northeastern North America.
• Alnus incana subsp. tenuifolia (Nutt.) Breitung (=A. tenuifolia Nutt.; Thinleaf Alder or Mountain Alder). Northwestern North America and Alaska.