Weeds of California and Other Western States
Joseph DiTomaso and Evelyn Healy. 2007. Oakland, CA: University of California Press.
This two-volume, 1,900-page reference was developed over six years and is the most comprehensive weed identification book ever produced in the United States. It contains detailed descriptions of seedlings, mature plants, flowers and fruit, germination and propagation characteristics, and descriptions of similar species for over 750 weed species.
Distributed by the University of California Agriculture and Natural Resources Communications Services