Robert W. Freckmann Herbarium


Because of technology changes and personnel changes at UWSP and the Wisconsin State Herbarium, the database of plant species housed at this site was merged with the database from the OLD WisFlora website to create a new Flora of Wisconsin website at Currently we are encouraging all Wisplant viewers to begin using the Flora of Wisconsin website as soon as possible. Wisplants will remain operational through July 13th. After that date, all traffic to Wisplants will be redirected to the Flora of Wisconsin website.

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  Alnus incana (L.) Moench subsp. rugosa (Du Roi) R.T.Clausen image
Photographer: Kenneth J. Sytsma           

Botanical Illustration

Derek Anderson

Matthew L. Wagner

Matthew L. Wagner

Matthew L. Wagner

Matthew L. Wagner

Robert H. Read

Robert W. Freckmann
Family Betulaceae
Alnus incana (L.) Moench subsp. rugosa (Du Roi) R.T.Clausen
mountain alder, speckled alder, swamp alder
Alnus: ancient Latin name derived from the Celtic, "growth along streams"
incana: gray
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Native
Plant: perennial tree/shrub to 30' tall with open, spreading branches; dark gray to reddish brown, smooth bark with whitish, prominent, horizontal lenticels; often in dense thickets
Flower: elliptical winter buds stalked and parallel to the twig; male catkin in 1 or more clusters 3/4"-2 3/4" long; blooms in early spring
Fruit:oval, stalked fruit clusters
Leaf:leaf oval to elliptic, firm, edges usually coarsely double toothed, not noticeably resin-coated
Habitat: moist to wet; streambanks, lakeshores, bogs, swamps, swales and roadsides

More Information Natural Communities Herbarium Specimens
All Alnus list Ethnobotany Information Google- Images or Text

Flora of North America (off site)
Alnus glauca Michx.
Alnus incana (L.) Moench f. tomophylla Fernald
Alnus incana (L.) Moench var. americana Regel
Alnus rugosa (Du Roi) Spreng.
Alnus rugosa (Du Roi) Spreng. var. americana (Regel) Fernald
Alnus rugosa (Du Roi) Spreng. var. tomophylla (Fernald) Fernald
Betula alnus L. var. rugosa Du Roi

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