Shade Gardening: Variety reverting to species?, 1 by dicentra63

dicentra63 wrote:
In 2007, I planted two kinds of Lamium maculatum in the same bed: "Aureum" and "Pink Pewter." Both are deliriously happy.

In mid-summer of this year, I discovered that around the edges of one of my Aureum specimens, the plain old species was growing, as shown in the photo.

Is the Aureum reverting to species? If so, what's the mechanism for this phenomenon? These guys don't reseed, do they?

(The Pink Pewter don't seem affected.)