SF Bay Area WildflowersMy favorite book for learning to identify SF Bay Area wildflowers by picture is Plants of the Coastal Redwoods. The color is wonderful. I used it to learn in two ways. The first was just going out on the trail, finding a flower, skipping to the right color section in the book, and flipping the pages like mad until I found what I was looking at. Later on, when I started yearning to see a particular new flower I'd note that it liked a particular microbiotic community e.g. Redwood Forest, then I'd choose my hikes accordingly.
Later on, I used Wildflowers of the West to learn to identify flowers by their component parts. I find that the more I learn the more I see, and the more I enjoy walking.
Sometimes I just feel like going back to page flippin' so I drag out Wild Flowers of Marin to try and identify some new species when I'm pretty sure what the family is.
Over time, I hope to add illustrations and an automated "key" to determine what family a flower is in using Inference's software product, CBR2.