Where are the base documents available?
Your article "Common Poisonous Plants and Plant Parts" says the information was "reprinted from materials provided by the Texas State Department of Health and the National Safety Council" but gives no link to look at the documents. Searching the home sites was not productive. So, where can one view the base documents or materials on which the article is based? It's not good data if one can't verify what you are saying!
I appreciate your concern on this issue. I did not write this particular article. It may not have a link when the document was cited or the link has been removed by "the Texas State Department of Health and the National Safety Council".