See Matthiola incana 'Dwarf Stock' for a brief description of the type.  Summer flowering with white flowers.  [JD].  ‘There is a very distinct type [of Stock] known as Wallflower-leaved, which was introduced many years ago from the Grecian Archipelago, and which has shining deep-green leaves, not unlike a Wallflower.’  [Robinson - The English Flower Garden and Home Grounds 10th Edition, p.680/1907].