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Malheur Experiment Station
Oregon State University

Toxicodendron rydbergii

poison ivy (Toxicodendron rydbergii)
Toxicodendron rydbergii
Common Names poison ivy
Family Sumac
Plant Type Shrub
Native Yes
Weed Can be

poison ivy (Toxicodendron rydbergii) poison ivy (Toxicodendron rydbergii) poison ivy (Toxicodendron rydbergii) poison ivy (Toxicodendron rydbergii) poison ivy (Toxicodendron rydbergii) poison ivy (Toxicodendron rydbergii) poison ivy (Toxicodendron rydbergii) poison ivy (Toxicodendron rydbergii) poison ivy (Toxicodendron rydbergii) poison ivy (Toxicodendron rydbergii) poison ivy (Toxicodendron rydbergii)
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Poison Ivy is related to cashew & pistachio nuts, which are members of the Cashew family. Poison ivy can be either a woody vine or shrub, depending on its environment. It grows along stream and canal banks, around lakes with tree cover, as well as in moist meadows. The leaflets at the end of branches grow in threes, often with some of the leaflets being bright red. As well as the dry pollens the oils (principally urushiol) can cause severe skin rashes. These rashes can be potentially dangerous if scratched and become infected.


For additional information please send an e-mail request to:
Dr. Clinton C. Shock
Clinton.Shock@oregonstate.edu

Malheur Agricultural Experiment Station
595 Onion Avenue
Ontario, OR 97914
(541) 889-2174
FAX (541) 889-7831

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