Morten St George Theory

[Morten St. George]

For the record I don't think all the plants are herbs and temperate. I think there are some trees and common tropical plants. Banana, almond, maybe Dracaena... This would just shift it from Dioscorides-like to Tacuinum-like.

I don't think native Americans viewed medicinal herbs and trees as two distinct things. Many of the herbal medicines used by them did in fact come from the bark, wood, roots or fruits of trees (pau d'arco is a well-known example). In drawings without measurement scales, it can be virtually impossible to distinguish a small shrub from a large tree.