It is certainly useful to learn about the native food resources in your area, but the bottom line for survival preparations - not a very big or dependable factor.
A real good guide for SoCal environments is "Chumash Ethnobotany" by Jan Timbrook. It also covers nonfood applications of the local flora - a good many of these could be quite useful - weaving baskets, cordage, etc.
The question for each of us is whether it is worth the time to build your knowledge base so if the "big or dependable" sources are exhausted or become unavailable, then you have a better chance at long term survival.
Thank you for the book reference!
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