Beautiful! I wonder if this is actually Matthiola incana or another species of Matthiola, rather than Erysimum. Eysimum has a common name of "wallflower," and after a little research I found that Matthiola is also sometimes called "wallflower." But it is more commonly referred to as "stock." It is very fragrant and comes in white, yellow, pink, red, purple.
Here is one that looks similar to your picture:
More entries of Matthiola:
Stock (Matthiola incana)
What do you think?
