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Alnus serrulata
http://www.botanical.com/botanical/mgmh/a/alder021.html
Short description and medicinal uses.
Alnus serrulata
http://www.biosurvey.ou.edu/shrub/alse2.htm
Description and images.
Alnus serrulata (Hazel Alder)
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=ALSE2
Brief profile, distribution map, photographs of foliage.
Alnus serrulata (Smooth Alder)
http://www.oplin.org/tree/fact%20pages/alder_smooth/alder_smooth.html
Photos, physical description, and habitat information.