|Alnus incana subsp. var.||Gray alder|
|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.
- Standard Cyclopedia of Horticulture, by L. H. Bailey, MacMillan Co., 1963