Images of noxious weeds from two different collections within the California Department of Food and Agriculture have been scanned by the CalFlora Database and added to the CalPhotos collection. 782 slides came from the CDFA Botany Laboratory slide collection, managed by Dean Kelch. 442 images came from CDFA Integrated Pest Control (IPC), managed by Dean Kelch. Slides from over 40 different photographers were selected from these collections.

Images were chosen to best represent the taxa available in these collections, showing plant habit, parts, and diagnostic characters when possible. A number of slides also illustrate experimental control plots, side-by-side comparisons, or maps of distribution at particular points in time. Some images (e.g. all IPC images) exist only in the low resolution versions available online. Questions about these slides should be directed to Dean Kelch. Click here for contact information.