Alnus viridis ssp. crispa (Mountain Alder)
- Image, plant synonyms, distribution map, and scientific classification. Includes conservation status.
- http://plants.usda.gov/java/profile?symbol=ALVIC

Alnus viridis ssp. sinuata
- Information on distribution and occurrence, value and use, characteristics, and fire ecology.
- http://www.fs.fed.us/database/feis/plants/tree/alnvirs/