Welcome to the California Department of Food and Agriculture

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PPDC Botany lab

Plant Pest Diagnostics Center - Botany Laboratory

Research Programs - Botany

CDFA Plant Systematists

Synopsis of some recent research projects

California botanical nomenclature

Fred Hrusa's Crosswalk

Dr. Fred Hrusa

This is an interface to the 2005 version of the nomenclatural crosswalk compiled by Dr. Fred Hrusa. The crosswalk is a database that accounts for the application of names of California plants. For the most part, The Jepson Manual of 1993 is the source of accepted names. The crosswalk is Dr. Hrusa's attempt to determine the Jepson name for names occurring in previous literature.

The crosswalk is neither exhaustive nor peer-reviewed (yet). It is made available by Dr. Hrusa with the hope that it will facilitate understanding of nomenclature of California plants.

Index Californicae

Dr. Fred Hrusa

Index Californicae: 35,723  Synonyms, Types and Discussion for California plant names, native and naturalized.  Constancea, in review

CDFA rated weeds location database

Dr. Fred Hrusa

May be served here in the near future.