a nicely indexed website with referenced information about entheogenic plants amd their alkaloids :

Plant Alkaloids

a couple of major mistakes on that page:

yes, the page hasnt been updated in a while it seems. still, its worth the look.

edit : another thing is, that section is not very well written, but it explains the difference between naturally ocuring LSD(lsa) and synthetic LSD. so its not totally bogus information.

there's no such thing as "natural LSD" (only natural LSA), because ethyltransferase isn't a widely expressed enzyme. I wouldn't call it bogus, just grossly inaccurate... unless they just meant it metaphorically, like the mushroom section ("New World Mushrooms Containing Natural LSD" )

i am aware that LSD is synthesized molecule. i wrote the sentence with his reasoning but i putted lsa in small brackets , next to "naturally ocuring lsd" so you would understand which molecule I was reffering to.