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Plant Information Online allows you to look up basic plant information and is especially good for discovering the Latin and common names of plants, as well as images that are freely and legally available on the web (usually from extension websites).
Academic Press Dictionary of Science and Technology (eBook)
The Academic Press Dictionary of Science and Technology, available through WVU Libraries Credo Reference collection, has information on Latin names of plants--just use the common name (for example, blueberry) and do a quick keyword search. Entries also include a "cite this" feature. Off-campus users will need to log on with their MIX user id and 6-digit password (day of birth + last four digits of your 700 number).
(Also available in print: Q123 .A33 1992 )
Access Science: Encylopedia of Science & Technology by McGraw-Hill Companies.
You can do a simple keyword search in Access Science: Encylopedia of Science & Technology by common name, or if you know it, by Latin name.