Are there any Computer Keys for Identifying Plants?

[Soaring Bear]

Hi:  Does anyone know of any computer software to key
out identifying plants?  Any region will do.
thanks
bear

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* UU  UU                SOARING BEAR                   *
* UU  UU A   Pharmaceutical Molecular Modeling         * 
*  UUUU AAA  U.A. New Pharmacy 404, Tucson, AZ 85721   *
*      AA AA e-mail:bear at ellington.pharm.arizona.edu   *