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Alnus serrulata

Alnus serrulata (Aiton) Willd.

Alnus incana (L.) Moench var. serrulata (Aiton) B. Boivin

Alnus noveboracensis Britton

Alnus serrulata (Aiton) Willd. var. subelliptica Fernald

Smooth Alder, Hazel Alder

KingdomPlantaePlants, but not fungi, lichens, or algae
SubkingdomTracheobiontaVascular plants—plants with a “circulatory system” for delivering water and nutrients
DivisionMagnoliophytaFlowering plants, also known as angiosperms
ClassMagnoliopsidaDicotyledons—plants with two initial seed leaves
SubclassRosidaeRoses, legumes, proteas, dogwoods, hydrangeas, mistletoes, euphorbias, grapes, many more
OrderFagalesBirch, she-oak, beech, walnut, bayberry, others
FamilyBetulaceaeBirch family: birches, alders, hazels, hornbeams and hop-hornbeams
GenusAlnusAlders ("alnus" means "alder")
SpeciesserrulataMinutely serrate

About plant names...

Smooth alders are usually small, somewhat disheveled looking trees, with many trunks and branches that sometimes seem to form an impenetrable thicket. As a group, alders’ most prominent feature is the small cone-like fruits, which remain on the tree through the winter. They are common at the edge of water, and in areas that are wet in the spring.


Alnus serrulata (Smooth Alder, Hazel Alder)

9/25/2010 · Nashua River Rail Trail, Groton Center, Groton, MA
≈ 6 × 4" (15 × 10 cm) ID is uncertain

Alnus serrulata (Smooth Alder, Hazel Alder)

9/25/2010 · Nashua River Rail Trail, Groton Center, Groton, MA
≈ 5 × 3½" (13 × 9.2 cm) ID is uncertain

Species”Cones”Flowers LeavesTrunk
Alnus serrulata On long thin stalks, ½-⅝" (1.3-1.6 cm) longBright yellow in spring, male catkins green-brown, female flowers about ½" (1.3 cm) 2-4" (5-10 cm), rounded edges or small serrations, dark green above, paler and with fine hairs belowSpeckled with horizontal lens-shaped spots, up to 20' (6.1 m)
Alnus incana ssp. rugosa On short stalksMale flowers 2½-5" (6.3-12 cm) long, hanging downward, female flowers about ½" (1.3 cm) around Oval-shaped, 2½-5" (6.3-12 cm) long, 2-4" (5-10 cm) wideSpeckled with horizontal lens-shaped spots
Alnus viridis Bunched upMale flowers about 2" (5 cm), female flowers point up, about ½" (1.3 cm) Relatively large serrationsHas diamond-shaped patches

Online References:

Alnus serrulata on Carolina Nature, from Will Cook

Alnus serrulata on Missouriplants.com

Alnus serrulata at the Virginia Tech Department of Forest Resources and Environmental Conservation

Alnus serrulata on Erv Evans' site at the North Carolina State University College of Agriculture and Life Sciences

Alnus serrulata at the Lady Bird Johnson Wildflower Center

Alnus serrulata on Plants for a Future, a resource and information centre for edible and otherwise useful plants

Alnus serrulata on eFloras


Sibley, David Allen, The Sibley Guide to Trees, Alfred A. Knopf, 2009, pp. 159-165

Little, Elbert L., National Audabon Society Field Guide to North American Trees, Eastern Region, Alfred A. Knopf, 1980, p. 363-4

Alnus serrulata (Smooth Alder, Hazel Alder)

12/23/2009 · Nashua River Rail Trail, Groton Center, Groton, MA
≈ 15 × 10" (37 × 25 cm)

Alnus serrulata description by Thomas H. Kent, last updated 12 Nov 2013.

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Alnus serrulata (Smooth Alder, Hazel Alder)

9/25/2010 · Nashua River Rail Trail, Groton Center, Groton, MA
≈ 4 × 6" (10 × 15 cm) ID is uncertain


About this map...