Poison Ivy March 2010

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Wildflower Spot – March 2010 John Clayton Chapter of the Virginia Native Plant Society Toxicodendron radicans Human sensitivity to the irritating oil urushiol is variable, and 15-25% of the population is not at President of the John Clayton Chapter, all allergic to poison-ivy and will never develop PoisonVNPS Ivy By Helen Hamilton, a reaction. Some people require prolonged exposure to the plant to develop a rash, but about half of all people will break out with a single contact, some requiring hospitalization. Without “Leaflets 3, let it be!” Relatively few plants the leaves, poison ivy vines are difficult to carry 3-parted compound leaves, and this is an identify in the winter, and for persons with high easy way to recognize a very irritating plant. sensitivity, touching a stem on a tree trunk will Not related to invasive English ivy, poison ivy cause an allergic reaction. can grow as an erect shrub or climber. Leaves are 3-parted and variable – they may be Despite poisonous effects of the plant on humans, stiff and leathery, hairy or not, shiny or dull, the fruits are relished by over 60 species of birds. toothed or not. The red fall foliage is especially Many seeds are passedv undamaged through their conspicuous. digestive systems, allowing wide distribution of this noxious vine. Twigs are brown with short aerial rootlets; old stems, covered with fibrous roots, look hairy. Small yellowish flowers blooming in May-July produce small clusters of white, ball-shaped fruits August-November. Poison ivy is found in every county in Virginia, and widely distributed throughout the eastern and central United (ToxicodendronStates. A close relative pubescens), with lobed leaflets of 3, poison oak does not extend into the northern states nor Canada, and grows in only a few eastern counties of Virginia. Photo: Toxicodendron radicans) Poison ivy ( taken by Phillip Merritt For more information about native plants visit www.vnps.org..

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