Science

Photographs and information on over 450 species, identification key, and full species list for the state.

Guide to the native trees of Britain, plus links to other web resources on forestry and conservation of British Native trees, including forest conservation organizations.

A site that covers common conifers only. Uses an interactive web based dichotomous key.

Historical, ancient, and biggest trees of Great Britain and Ireland.

Provides quick identification of 100 common conifer and evergreen trees of the North American forest using a tree finder key, photographs and other features.

A tree database for California. Includes non native trees.