Joe DiTomaso California Weeds Version 3.1 (2007) The Western Society of Weed Science is proud to introduce a comprehensive identification expert computer-based identification guide to weedy broadleaf and grass species in the western US. The two-CD pack contains over 4000 color photographs and illustrations of 754 broadleaf species and 231 grasses. The weed identification software is an interactive program that is easy to run and uses plant characteristics to identify weeds. In many cases it is possible to identify a plant specimen to one species or to a couple of choices using only vegetative characteristics, dried plant material, or even a portion of the plant.