An oily resin called urushiol, which is found in all parts of the plant, is what causes skin rashes when people come in contact with it. People vary in their sensitivity to poison ivy, but may become more sensitive after repeated exposure to it. One common misconception is that the poison ivy rash itself is contagious.
The scientific name of the plant is Rhus radicans or Toxicodendron radicans. Knowing the old rhyme of "Leaves of three, let it be" is a nice start, but it does not go far enough. These photos will allow you to identify the plant both with and without leaves and at various stages of maturity.
Poison Ivy. Poison ivy, the notorious cause of itchy, blistery rashes, grows throughout the continental United States and much of Canada. Poison ivy prefers partial sunlight, so it often grows where the land has been disturbed, such as along the edges of trails, fields, or landscaping.
Pacific poison oak, or Toxicodendron diversilobumis a serious problem plant. Although it grows almost entirely in California, a lot people live there. It grows as a ground vine, as a shrub, and as a climbing vine.
Poison Ivy is out in full force right now. Its viney being can be noted in local fields, climbing up trees, taking over gardens, and growing roadside all across the Eastern Shore. The three-leaved bandit is very hard to eradicate, serves no real purpose as a plant, and makes most who come into contact with it break out in a horrendous rash.
But as it turns out, a lot of harmless plants — like aromatic sumac skunkbushVirginia creeper and boxelder — are commonly mistaken for poison ivy. Here are some helpful hints on identifying and removing poison ivy:. Sensitivities can develop over time.
Every year millions of people are exposed to this toxic plant after touching or brushing up against it. To those who are susceptible, allergic reactions can range from mild redness and itching to a severe rash with blistering and oozing sores. Some cases have required a hospital visit.
Exercise extreme caution when it comes to these and some other common plants around your home and garden. The leaves, vines and even the roots contain a natural oil called urushiol that causes allergic reactions in most people — up to 80 or 90 percent of us, according to the Centers for Disease Control and Prevention. Worse, the rash is tough to get rid of. Although you can buy over-the-counter medications, or visit your doctor if you need something stronger, you can scratch until the rash turns into ugly bumps or oozing blisters that last for up to three weeks.
Poison Ivy Toxicodendron radicans is a native plant and one of the most hated, not only because of the itchy rash caused by the slightest contact, but also because it is so difficult to spot. The appearance of the leaves and the growth habit are so variable that even experienced outdoors people can be fooled. Poison ivy is also extremely common, and apt to grow where people are sure to encounter it.
Must be eradicated or controlled for public safety along rights-of-ways, trails, public accesses, business properties open to the public or on parts of lands where public access for business or commerce is granted. Must also be eradicated or controlled along property borders when requested by adjoining landowners. Minnesota Noxious Weed Law. Poison ivy prefers woodland and savanna habitats.