Poison Ivy

Poison ivy (Toxicodendron radicans) is found in most regions of the United States, excluding most of the west coast and the states of Nevada, Hawaii and Alaska. It is known by several different names, such as three-leaved ivy, and poison creeper. Although it can grow as a woody, self-supporting shrub, it usually grows as a vine running along the ground, or growing on shrubs and trees. The vines can grow to several inches in diameter over a number of years. Poison ivy can grow in non-cultivated sites, such as along stream banks, near roadways, and in woodlands. Likewise, it can grow in ornamental shrubs or perennial borders.

 

What does Poison Ivy Look Like?

The best way to identify poison ivy is by its typical compound leaf made up of three leaflets. The leaflets can be two to four inches long, and can have a dull or glossy green finish. The poison ivy leaflets usually have pointed tips. The middle leaflet is generally larger than the two laterals. The three leaflets occur alternately along the stem. Leaves on the same poison ivy vine often have a number of color and leaf margin combinations. As a vine climbs shrubs and trees, it produces numerous roots that attach to the tree or shrub. The roots often give the vine a "fuzzy twine" look.

 

The flowers of poison ivy are typically unassuming and occur in clusters above the leaves. They are yellowish-green in color and are produced in June or July. The berry-like fruit is waxy and grayish-white.

 

How Can I Prevent Poison Ivy?

 

Poison Ivy and Urushiol
Poison ivy plants produce an oily toxicant called urushiol , which is capable of causing severe skin irritations. Severity of reaction to the poison ivy oil can vary greatly from person to person. The transfer of this oil to the skin can occur through contact with the leaves, stems, fruit, roots or flowers of the poison ivy. Direct contact with the plant is usually the method of exposure, although an individual can also be exposed by handling clothing, tools, objects or animals that have become contaminated with the oil. Individuals can also be exposed to the urushiol oils through the burning of the poison ivy plants. The burning of the plants emits particles that carry the oil into the air. Coming in contact with the smoke can cause severe cases of poisoning. Persons who suspect they have inhaled this smoke should contact a doctor immediately.

 

Contrary to popular belief, the rash from poison ivy cannot be transmitted from touching the oozing blisters. The rash is transmitted only through the poisonous plant oils themselves.

 

What are the Symptoms of Poison Ivy?

How Can I Treat Poison Ivy?

 

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