Poison Ivy

The characteristic three-leaflet structure of poison ivy stands as a warning signal. Poison ivy produces resins that cause an allergic reaction in most people and direct contact with the plant is not required for irritation to occur. Indirect contact through contaminated clothing or animals or with smoke from the burning plant will also produce symptoms.

Poison Ivy," Microsoft® Encarta® 96 Encyclopedia. © 1993-1995 Microsoft Corporation. All rights reserved.

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