thinleaf alder Betulaceae Alnus incana ssp. tenuifolia (L.) Moench ssp. tenuifolia (Nutt.) Breitung Listen to the Latin symbol: ALINT Other Fact Sheets
Leaf: Alternate, simple, oval, doubly serrated, 2 to 4 inches long, dull dark green above, paler with slight pubescence below, obviously thin.
Flower: Species is monoecious; in small clusters, preformed male catkins are 1/2 to 1 inch long, slender and green; females are much smaller, reddish green, open in early spring.
Fruit: Cone-like, 1/2 inch long, brown when ripe, each scale enclosing a very small winged seed, mature in late summer, and persistent.
Twig: Moderate, gray-brown to reddish brown, velvety, lighter lenticels, buds stalked, plump and reddish brown.
Bark: Smooth gray-green to reddish brown with numerous conspicuous horizontal white to light orange lenticels, becoming scaly on old trees.
Form: A thicket-forming suckering shrub or small tree that reaches 25 feet in height, and may reach 40 feet.

Looks like: speckled alder - hazel alder - Sitka alder - white alder
leaf flower fruit twig bark form1 map
Additional Range Information:
Alnus incana ssp. tenuifolia is native to North America.
Range may be expanded by planting.
See states reporting thinleaf alder.
External Links:
USDAFS Additional Silvics
USDA Plants Database
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Photos and text by: John Seiler,
Edward Jensen, Alex Niemiera,
and John Peterson
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