Betula lenta (Sweet Birch)
- Images, distribution map, scientific classification, and wetland indicator status.
- http://plants.usda.gov/java/profile?symbol=BELE

Betula lenta
- Image of leaves and catkin.
- http://tenn.bio.utk.edu/vascular/database/vascular-photos-enlarge.asp?CategoryID=Dicots&FamilyID=Betulaceae&GenusID=Betula&SpeciesID=lenta&PhotoNameID=be_lent1&PhotographerNameID=Wofford%20and%20Chester

Betula lenta (Black Birch)
- Describes characteristics of leaf and fruit, habitat, ethnobotany, and wildlife uses. Provides images.
- http://www.oplin.org/tree/fact%20pages/birch_black/birch_black.html

Betula lenta (Black Birch, Sweet Birch)
- Describes physical characteristics and provides photos of leaf, twig, flower, bark, and form.
- http://www.cnr.vt.edu/dendro/dendrology/syllabus/blenta.htm