Penstemon

I found these penstemons along Highway 58, just west of Tehachapi this afternoon. They were a little past their peak, as evidenced by the piles of dried flowers under the bushes,
but there were still a fair amount in bloom.

This is another one of those, "I'm-not-sure-about-the-species," finds that will stay that way until someone takes pity on me and lets me in on the secret or (more unlikely) I manage to look it up.