Toxic and potentially carcinogenic, Petasites hybridus was used in the Middle-ages to fight the plague. Like Coltsfoot (f8r) this plant is drawn in the VMS without its very large leaves. This find was suggested by a drawing in the Witchcraft Medicine book (Muller-Eberling, Ratsch, Storl) . Unfortunately, most of the other correlations in the VMS to drawings in this book have already been identified. But I am very pleased with this match. The characteristics of the drawing in the VMS seemed to suggest a weed of some type and I had already spent quite a bit of time trying to identify this plant. The author of the VMS has purposefully left out the prominent leaves, perhaps as a means of concealment by not divulging all the pertinent information or maybe the leaves were just not of great interest/importance.
Petasites hybridus: (butterbur, butterfly dock, butter-dock, bog rhubarb, flapperdock, umbrella leaves)
Mercury: (hat supposedly made from Butterbur leaf?)