See post #116. Those drugs with no recognized medical use in the U.S. are placed in Schedule I. There are a number of drugs in this Schedule -- I don't recall if there are any other plants.
Perhaps if you would get to the point, if you have one, maybe I could answer your question.
No real point, just bored, and didn't really like your attitude.
I do have a question though about abuse. Who determines if it's abused, or just used? And what exactly is abuse of plant matter? Burning it, enjoying it, feeling good? Don't people already abuse alcohol, and that has to be manufactured specifically in order to abuse it.
Gotta go.