Biology 130
Alnus spp.; alder
[Betulaceae]
Trees or shrubs with broad deciduous leaves.
Buds are notable for being
stalked. Staminate
flowers in long (4-6") catkins, pistillate flowers in a cluster with
woody bracts that persist like miniature conifer cones long after the
fruits have been shed. Of
the 3 Wisconsin species,
A. incana (speckled alder) is probably the most familiar.
It is a coarse, weak-wooded shrub that forms dense thickets along
northern Wisconsin streams. [086]
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