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Database of publications used to verify the entry of publication names in the Harvard Herbaria catalog.

Searchable database all 8375 currently recognized vascular plants in California, including 20000 photographs.

AGORA

The official site of the National Agricultural Library

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AMIS is a G20 initiative. It is a global agricultural market information system that concerns itself with matters relating to wheat, maize (corn), rice and ...

The Botanical Society of the British Isles is the leading organisation for identification of British and Irish plants.

U.S. Department of Agriculture Home Page