The blisters and oozing result from blood vessels that develop gaps and leak fluid through the skin; if the skin is cooled, the vessels constrict and leak less. , The pentadecyl catechols of the oleoresin within the sap of poison ivy and related plants causes the allergic reaction; the plants produce a mixture of pentadecylcatechols, which collectively is called urushiol. Around 15 to 25 percent of people have no allergic reaction to urushiol, but most people have a greater reaction with repeated or more concentrated exposure. Its distinct feature though is a scalloped, wavy form only less defined than oak tree leaves. From Wikipedia, the free encyclopedia Toxicodendron is a genus of flowering plants in the sumac family, Anacardiaceae. But even identifying poison ivy can be tricky. A mature plant growing up a telephone pole often takes on the look of a nice landscape specimen.  Clothing, tools, and other objects that have been exposed to oil should be washed to prevent further reactions.. , Urushiol binds to the skin on contact, where it causes severe itching that develops into reddish inflammation or uncoloured bumps, and then blistering. Tea Tree Oil. This woody weed can have an upright form up to 7 ft. tall or appear as a climbing vine, hanging on to trees or fences with dark aerial roots.  If poison ivy is eaten, the mucus lining of the mouth and digestive tract can be damaged.  There is evidence which points to keeping Toxicodendron as a separate monophyletic genus, but researchers have stated that the Toxicodendron and Rhus groups are complex and require more study to be fully understood..  The appearance of a spreading rash indicates that some areas received more of the poison and reacted sooner than other areas or that contamination is still occurring from contact with objects to which the original poison was spread. Poison ivy can occur as a vine, climbing trunks of trees or along the ground, or it can grow in large patches as an upright shrub. You can mix one teaspoon tea tree oil with 1/8 cup almond oil. The generic name is derived from the Greek words τοξικός (toxikos), meaning "poison," and δένδρον (dendron), meaning "tree". The leaves may have smooth, toothed or lobed edges, and all three types of leaf edge may be present in a single plant. It is still used in many tropical and subtropical countries in the production of wax match sticks. Twigs of poison ivy may be covered with fine hairs. People who are sensitive to urushiol can also experience a similar rash from mangoes.  Over-the-counter products to ease itching—or simply oatmeal baths and baking soda—are now recommended by dermatologists for the treatment of poison ivy. Left, Poison ivy aerial roots. A ground vine found a tree stump, climbed up, Poison ivy has aerial rootlets that it uses to attach to the bark of trees. extremely variable in form. Poison-ivy is a woody perennial. ; Sometimes it looks a like a bush or a shrub. Avoid Spreading the Oil – The rash may be spread by touching the plant, contaminated clothing, surfaces, or body part, then touching another body part. Here is a look under the vines as it "explodes" in all directions. I have never seen this before in 65 years of staring at poison ivy. It is well known for causing urushiol-induced contact dermatitis, an itchy, irritating, and sometimes painful rash, in most people who touch it. Poison Ivy (left) and Box elder tree leaf (right). Toxicodendron is a genus of flowering plants in the sumac family, Anacardiaceae. One of many great inpiration images about Poison Ivy Growing On Tree from sharonsala.net. 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