Yellow Goat's-beard (tragopogon dubius).
See this page.
I got a look at the flowers today and yesterday. The reason I hadn't seen the flowers before, was that they close so early in the day. They looked like some kind of alien dandelion. Or a dandelion that crossed with...I don't know...some kind of weird botanical specimen, anyway.
Fortunately, I got a lead from a field guide, and found the answer on the Internet.
Never seen one before, but what we have is a CHAMPION specimen of trapogon dubius -- yellow goatsbeard.
And, the important thing...it's edible.