Family: Betulaceae Birch Family
Genus: Alnus Alder
Genus of about 30 species of ornamental shrubs and trees distributed throughout the Northern Hemisphere and western South America on cool, wet sites.
Scientific Name: Alnus P. Mill.
Common Name(s): Alder
Growth Type: perennial
Species Description:
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 | Caption: Alder's alternate, doubly serrated leaves and its immature fruit nutlets.
ID: Hrb-ALUSS-001
Source: 35mm slide (photo)
Credit:
Keyword(s): fruit, leaf, mature, stem
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 | Caption: Alder's doubly serrate leaves and its immature, winged nutlet.
ID: Hrb-ALUSS-002
Source: 35mm slide (photo)
Credit:
Keyword(s): fruit, leaf, mature, stem
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 | Caption: Alder's doubly serrate leaves, its male 2-4" catkins, and its stalked reddish buds.
ID: Hrb-ALUSS-003
Source: 35mm slide (illustration)
Credit:
Keyword(s): flowering, inflorescense, leaf, mature, stem, vegetative
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