Weed Identification Tool
( web address says Wisconsin but site will be UC Davis )
Identify weeds using the photo gallery at UC Davis IPM Online
Cal-Weed Mapper
List of State-listed noxious weeds for California
Weed Research and Information Center
California Invasive Plant Council (Cal-IPC)
California Invasive Plant Council (Cal-IPC) Plant Profiles
Cal-IPC Invasive Plant Inventory
Encycloweedia
Calflora Plant Search
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Trinity County RCD Home Page