"AlgaeBase is an electronic store of information on the algae of the world and includes terrestrial, marine and freshwater forms...

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...

A collection of more than "20,000 descriptions of Earth science data sets and services covering all aspects of Earth and environmental sciences...

Searchable worldwide checklist of plants both vascular and non-vascular...

A listing of all generic (genus) names of cryptogramic plants, hepatics, ferns, algae, fungi, and lichens in order to "reveal homonymy between groups...

The ITIS is the result of a partnership of federal agencies formed to satisfy their mutual needs for scientifically credible taxonomic information...

A primary resource for professionally developed plant information databases...

Database of the names and associated basic bibliographical details of all seed plants; includes indexes to accepted abbreviations for authors and sources...

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...

"Includes descriptions and occurrences of many thousands of extinct plants...

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...

A record of essential taxonomic information on vascular plants worldwide...

A "collection of information about biodiversity compiled collaboratively by hundreds of expert and amateur contributors...

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