Technically, the President can move Marijuna off the schedule 1 list with a signature. That itself would change a lot of things.
// for the truly weird look at the Cotton Lobby's effect on mj laws
// for the truly weird look at the Cotton Lobby's effect on mj laws
(21 USC 841)
Opium poppies are also listed by name, but while you can grow them in your flower garden (but putting one in a vase on your dining table is a crime!), you can't even grow cannabis.