Cascade Wallflower, Sand-dwelling Wallflower
Synonyms: Erysimum arenicola var. torulosum, Erysimum perenne var. tephrinum
What may be cascade wallflower as seen on south-facing slopes high on Klahhane Ridge, Olympic National Park........July 27, 2014. The yellow petals and greenish foliage suggest this may be Erysimum arenicola, but the flattened fruits are more diagnostic.