Robert W. Freckmann Herbarium


  Alnus glutinosa (L.) Gaertn. image
Photographer: Michael Clayton           

Botanical Illustration

Botanical Illustration

Kurt Stüber

Paul Drobot

Paul Drobot

Paul Drobot

Paul Drobot

Paul Drobot

Paul Drobot

Robert R. Kowal

Robert W. Freckmann
Family Betulaceae
Alnus glutinosa (L.) Gaertn.
black alder, European alder
Alnus: ancient Latin name derived from the Celtic, "growth along streams"
glutinosa: very sticky
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Introduced - locally established; potentially invasive
Plant: perennial tree to 40'-60' tall, often with several trunks and a narrow crown; dark brown, smooth bark becoming darker and breaking into fissures with time; pale, horizontal lenticels
Flower: winter buds stalked; male catkins in 1 or more clusters 1 1/2"-5" long; blooms in early spring
Fruit:oval to nearly round, stalked fruit clusters; samaras obovate, wings only narrow, thickened ridges
Leaf:leaf obovate to nearly oval, leathery, edges coarsely and often irregularly doubly toothed; heavily coated with resin on top and bottom
Habitat: moist to wet; streambanks, floodplains, wetland edges
Notes: the hard wood of this tree was used extensively in Europe as lumber, for carving, and for wooden shoes
(Glossary)

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

Flora of North America (off site)
Synonyms 
Alnus alnus (L.) Britton
Alnus vulgaris Hill
Betula alnus L. var. glutinosa L.

         
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