And dont forget that before the 19th century, perhaps even before the 20th century, 99.999% of people on the Earth thought *nothing* of CP's..
because they were not aware they even existed!
Only two very small groups of people would have been aware of them at all:
1. The locals who happened to live among the plants.
2. a very small and select group of scientists who had access to books and scientific journals.

Today we take it for granted that we can find out about virtually anything, anywhere..
That was not the case in the recent past..