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OK
Here are a couple sites to check out. I just did a search in Google for "poisonous plants" and lots of others came up too.
The first site is from the Government of Canada.
Hope this helps!
http://www.cbif.gc.ca/pls/pp/ppack.list?p_sci=comm&p_type=all&p_x=px
http://www.ansci.cornell.edu/plants/comlist.html