I took a little trip up to the North Coast this weekend and got some nice pics of coastline, sorrel, and everything in between:
Oddly, I'd never realized that sorrel wasn't just regular old clover. Underneath the leaves, it's purple. A plant example of convergent evolution! I'm also mystified by why it doesn't appear in the closer-in Bay Area redwood preserves (like Redwood Park or Muir Woods; it does appear in Samuel Taylor).