Directories

CalFlora Database
provides access to information about all 8375 currently recognized plants in California, including more than 670,000 plant observations and 20,000 photographs.
http://www.calflora.org/

Dr. Scott Russell's Botanical Links
Variety of informative, up-to-date, plant-related links from the Univ. of Oklahoma.
http://www.ou.edu/cas/botany-micro/bot-linx/

International Organization for Plant Information
Manages a series of cooperative international projects that aim to create plant taxonomic information databases; also includes useful general botanical links - commissioned by the International Union of Biological Sciences.
http://plantnet.rbgsyd.nsw.gov.au/iopi/iopihome.htm

Internet Directory for Botany
an index to botanical information available on the Internet. It consists of two parts, an alphabetical directory and a categorical directory.
http://www.botany.net/IDB/

Internet Directory for Botany: Algae, Bryophytes, Fungi
links to many interesting sites in lower plants, e.g. algae, bryophytes and fungi.
http://www.helsinki.fi/kmus/botcryp.html

MBG: W3TROPICOS
Database of plant names, information on them, and the sources of information.
http://mobot.mobot.org/W3T/Search/vast.html

Plants For a Future
A resource centre for rare and unusual plants, particularly those which have edible, medicinal or other uses. The site contains an online database of over 7000 plants.
http://www.comp.leeds.ac.uk/pfaf/index.html

Schoolhouse: Science: Botany Resources
A list of links related to various aspects of botany.
http://teacherpathfinder.org/School/Subjects/Science/botany.html

USDA PLANTS Database
Plant names, photos, fact sheets, and information on culturally significant plants, noxious and invasive plants, and threatened and endangered plants, with links to thousands of plant-related sites and software tools.
http://plants.usda.gov/

World-Wide Web Virtual Library: Botany
Collection of scholarly and research links for plant biology.
http://www.ou.edu/cas/botany-micro/www-vl/