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"A man does not plant a tree for himself, he plants it for posterity." - Alexander Smith   


European Alder
(Alnus glutinosa)

Donated by Kaskaskia College Secretaries
Tree Map Location: # 24

European Alder leaf European Alder catkins European Alder fruit European Alder bark European Alder twig

Leaf: Alternate, simple, oval to orbicular, 2 to 4 inches long, 2 to 3 inches wide, rounded or slightly notched tip, doubly serrate margin, dark green above, lighter below with some scruffy pubescence in vein axils.  
Flower: Monoecious; males slender, reddish-brown catkins (1 to 1 1/2 inch long), much longer when shedding pollen; females small (1/6 inch) reddish-brown, cone-like catkins in clusters near branch tips.  
Fruit: Cone-like woody catkin, initially green, turning brown when ripe, 3/4 inch long, egg-shaped, contain many small winged nutlets, persistent through winter.  
Twig: Green and sticky when young, later turning greenish brown; buds are stalked, purplish brown in color and somewhat three sided.  
Bark: Initially smooth and grayish green, later turning grayish brown and developing irregular, small broken patches.  
Form: Medium tree with a very narrow, upright crown; in its native habitat it reaches 80 feet tall and several feet in diameter; rarely get very large in North America.  
Source: College of Natural Resource Virginia Polytechnic Institute and State University  
Website: http://www.cnr.vt.edu/dendro

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