Tsuga
- Description of the genus and its 8 species.
- http://www.conifers.org/pi/ts/

Tsuga heterophylla (Western Hemlock)
- Features photos of entire tree, leaves, cones, and bark. Describes physical characteristics, habitat, and human uses.
- http://www.for.gov.bc.ca/hfd/library/documents/treebook/westernhemlock.htm

Tsuga mertensiana (Mountain Hemlock)
- Describes physical characteristics and habitat. Provides photos of entire tree, leaves, cone, and bark.
- http://www.for.gov.bc.ca/hfd/library/documents/treebook/mountainhemlock.htm

Tsuga mertensiana
- Distribution and occurrence, value and use, characteristics, and fire ecology.
- http://www.fs.fed.us/database/feis/plants/tree/tsumer/

Tsuga caroliniana
- Distribution and occurrence, value and use, characteristics, and fire ecology.
- http://www.fs.fed.us/database/feis/plants/tree/tsucar/

Tsuga canadensis
- Information on distribution and occurrence, value and use, characteristics, and fire ecology.
- http://www.fs.fed.us/database/feis/plants/tree/tsucan/