On Sun, 23 Jun 2013 16:01:07 -0700, David E. Ross wrote:

It looks like mustard to me. Wild mustard is found extensively in
California, turning the hills near my house bright yellow in the spring.

Hi David,
I think you're right (at least I hope you are, as I tasted a few florets
today, and they tasted much like broccoli).

http://www2.picturepush.com/photo/a/...g/13402725.jpg

I just can't seem to find the mustard seeds though ...