Identifies the trees and shrubs of North America, using simple identification keys...

"A guide to quality forestry and natural resources information on the Internet with over 1500 links" on urban, tropical, temperate and agroforestry...

Endangered species of plants and animals in a database, searchable by status, country, habitat, year of assessment, marine region, major threat type, taxonomic, common name...

Database of "information on more than 65,000 plants, animals, and ecosystems of the United States and Canada," including particularly in-depth coverage for rare and endangered species...

A source for vascular plants, mosses, liverworts, hornworts, and lichens indigenous to the United States and its territories, as well as information on endangered, agriculturally useful, noxious and wetland indicator species...

Information on endangered species in the United States, provided by the governmental agency that deals most directly with the problem...

"ETI's World Biodiversity Database is a continuously growing taxonomic database and information system that aims at documenting all presently known species (about 1...