Depending on if you want to use wild sources or to if you have the possibility to
grow on your own. The phalaris-strains from Appleseed's research are a good starting-point.
Actually, Psychotria viridis can be grown indoors with quite good results. Actual underground research gets into other plants like Phyllodium spp., whose seeds can easily be pruchased in your country. Wild harvesting of Phalaris isn't the ideal method in my experience, but can bring some results, especially if your are looking for 5-MeO containing plants, but pure N,N-strains are rare in nature. Good luck!
Arthur Dee was one of the greatest alchemists of all time, not likely to his dad, I forgot his name, this small James Bond sorcerer working for the queen of a... Hail Arthur!