Douglas' wallflower
Erysimum capitatum
Brassicaceae

None of the books I have at home are in agreement for the common name or the scientific name. I'm a bit confused. It's also known as western wallflower and/or Erysimum occidentale and there are several subspecies of E. capitatum. This is a native mustard. I can always count on seeing this bright orange flower along the CV Road in the spring.