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"Poisonous" does not mean deadly. Some manifestations of toxicity are subtle. The dose, as always, determines if a plant is safe source of nutrients or a toxic hazard.

Toxicodendron diversiloba (Poison Oak)

Right: Western Poison Oak, Spring growth in Sierra foothills





Below: Several congeners of the active ingredient, urushiol
A dairy goat dining on poison oak
(Photo by Jack Kelly Clark, California Agriculture 46(3):cover)

This series of web pages was created by an undergraduate student at Cornell University for the AS625 class.

WARNING: These web pages are only meant to be informative. Neither Cornell University nor the author of this site endorse or recommend the use of these plants.