roses - you obviously have a computer so the quickest way to find lists, both extensive and incomplete, is to go to Google and type in the short phrase list of poisonous plants. Pick any entry that pops up and it will give you far more information and references than most people have time and/or patience to type out.

Sorry if that seems terse but the ability to do a bit of independent research is a real good arrow to have in your gardening and landscaping quiver.