:n/p On 2/07/03 Sallie Keeper posted a link to a site with a poison plant list. Also, when you say tigerlilies, are you referring to Asiatic or Oriental lilies(lilium), or daylilies(hemerocallis sp.)? It could make a difference. I know that daylilies are not toxic to humans, and in fact the flower buds are an edible delicacy.
Sorry to use the Latin on you, but I'm a landscaper, and common names of plants can be meaningless, because they vary so much. Good luck!