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/
Manages a series of cooperative international projects that aim to create plant taxonomic information databases; also includes useful general botanical links - commissioned by the ...
http://iopi.csu.edu.au/iopi/
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/
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
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 pl...
http://plants.usda.gov/
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