Lori and Russ Holtman suggested on the VMs list that the drawing on fol. 46r maybe inspired by the Biblical story of the 10 plagues of Egypt. The leaves on the plant appear as if they are blown by wind (the East wind brought the plague of locusts and the West wind blew them into the Red Sea) and the roots remind of insects legs.
I like Lori and Russ's idea and based on it I will place Fleabane as plant id on my list. In the old herbals fleabane appear by the name 'policaria' so I will go with Common Fleabane - Pulicaria dysenterica. The third plague of Egypt was lice/gnats/fleas and fleabane was believed to repel those parasites.
The French common name for Pulicaria is Herbe Saint-Roch. In the 15th century Saint Roch was evoked in case of bubonic plague.