These two forms should have their provenance available at a California botanical garden or herbarium. I have a salvia I got a long time ago from Smoth College that I called S. involucrata but probably is the pink bracted form of wagneriana. It shares a crimson band around the nodes with the white form. In both forms, the transition to the bracts from the adjacent leaves is not always sharp, and the leaves often have white sections and a vein structure intermediate between those of a normal leaf and those of the bracts.

The only other time I see this is when some sages decide to try to bloom in the spring, and a warm spell interferes, throwing the transformation into reverse, and generating some strange foliage.