controlled substances

Lets just say that I’m walking through the woods and I come upon a plant. Upon eating the fruit of this plant I become highly “stoned”. After collecting all that I can carry, I head back home. Upon research of this botanical wonder I find that there is no record of its existance.
The question: Would it be legal for me to go around eating/selling this stuff? Also, who and decides to make it an illegal drug?

From United States Code, chapter 21, Section 802(6):

From Chapter 21, Section 811(a):

So depending on the active ingredient in your mystery plant, it may or may not be OK for you to consume and sell it.

Skeptic, to answer your question, I’ll need to know the exact location of the woods and a precise description of the plant and its fruit.