Guide to Poisonous Plants

[Anita]

The Poisonous Plant Guide is constructed to enable location of a
plant by either knowing the common or botanical name of the plant.
Alternatively if the plant is not known, but the disease symptom
is, it is possible to search by the presenting clinical sign
eg: Abortion, Sudden death, photosensitization.

from Dr. A.P. Knight

http://www.vth.colostate.edu/poisonous_plants/report/search.cfm

oder

http://cal.vet.upenn.edu/poison/index.html