Grey Alder

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 Alnus incana subsp. var.  Gray alder
Speckled Alder Alnus incana subsp. rugosa
Habit: tree
Height: to
Width: to
70ft 30ft
Height: warning.png"" cannot be used as a page name in this wiki. to 70 ft
Width: warning.png"" cannot be used as a page name in this wiki. to 30 ft
Lifespan: perennial
Exposure: sun
Features: fire resistant
Hidden fields, interally pass variables to right place
Minimum Temp: °Fwarning.png"°F" is not a number.
USDA Zones: 3 to 9
Sunset Zones:
Flower features:
Betulaceae > Alnus incana var. ,

Standard Cyclopedia of Horticulture

Alnus incana, Willd. Shrub or tree, to 60 ft. : branches pubescent: lvs. oval or oblong-ovate, acute, 1 1/4-4 in. long, doubly serrate, pubescent or nearly glabrous beneath: cones 4-8; mostly sessile, 1/2 in. long. Northern hemisphere, in different varieties. CH

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

  • 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 (A. hirsuta; Manchurian Alder). Northeastern Asia, and central Asia in mountains.
  • Alnus incana subsp. kolaensis. Subarctic northeast Europe.
  • Alnus incana subsp. oblongifolia (A. oblongifolia; Arizona Alder). Southwestern North America.
  • Alnus incana subsp. rugosa (A. rugosa; Speckled Alder). Northeastern North America.
  • Alnus incana subsp. tenuifolia (A. tenuifolia; Thinleaf Alder or Mountain Alder). Northwestern North America.

From SCHCH: Var. glauca, Ait. (A. glauca, Michx.). Shrub, to 12 ft.: lvs. often nearly glabrous beneath. N. Amer., Eu. Em. 251.

Var. vulgaris, Spach. Tree, to 50 ft.: lvs. usually densely pubescent beneath: cones 1 in. long. Eu., Asia.

Var. pinnatifida, Spach (var. laciniata, Hort.). Lvs. pinnately lobed or cleft, with dentate lobes.


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