I'm not sure of a list, but one that's most likely a no-no is the dieffenbachia. Its common name is Dumb Cane because when injested or just put ON the tongue, the sap has numbing properties. It's dangerous for kids, cats/pets, so probably wouldn't be safe for snakes. I don't RECALL warnings against getting the sap on the skin, but it's been quite a while since I owned one. My ex wasn't into proper care of the house & it got too cold during the winters, killing my houseplants.