Betula occidentalis Betula occidentalis: Information on distribution and occurrence, its value and use, characteristics, and fire ecology. (Betula) http://www.fs.fed.us/database/feis/plants/tree/betocc/
Betula pumila Betula pumila: Image and description. (Betula) http://www2.state.id.us/fishgame/info/cdc/plants/plants_A-D/betpum.htm
Betula lenta Betula lenta: Uses and description. (Betula) http://www.hort.purdue.edu/newcrop/duke_energy/Betula_lenta.html
Betula nigra Betula nigra: River Birch. (Betula) http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=BENI
Betula alba Betula alba: A short description and medicinal uses. (Betula) http://www.botanical.com/botanical/mgmh/b/bircom43.html
Additional
Information: Canadian Content has no additional information.
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