Photographer: Michael Clayton
Alnus glutinosa (L.) Gaertn.
black alder, European alder
Alnus: ancient Latin name derived from the Celtic, "growth along streams"
glutinosa: very sticky
|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|