What permit do I need to bring a bonsai tree to the United States?

I bought a bonsai on my trip to Ecuador. Now that I'm going back to the US, I would soooo like to bring it back with me. U.S. Agriculture regulations are so complicated and I really don't know what are the things (permits, documents, forms) I need to fill out to be able to bring it with me. Please, please give me any advice. Thanks. Btw, I don't know if it matters but I am a US resident.|||You can't. The US only allows plants and flowers from licensed importers. Leave it there, or have it confiscated at Customs.