poison ivy

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Related to Toxicodendron radicans: Rhus radicans

poi·son i·vy

, poison oakpoison sumac (poy'zŏn ī'vē),
1.
2. Common name for the cutaneous eruption (Rhus dermatitis) caused by contact with these species of Toxicodendron.
Farlex Partner Medical Dictionary © Farlex 2012

poison ivy

n.
1. A North American shrub or vine (Toxicodendron radicans) that has compound leaves with three leaflets, small green flowers, and whitish berries and that causes a rash on contact.
2. A skin rash caused by contact with this plant. In both senses also called poison oak.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
Pharmacognosy A plant that is highly allergenic due to urushiol—which is also present in mango, japanese lacquer tree, cashews, as well as poison oak and poison sumac
Common urushiol-rich plants Poison ivy (Toxicodendron radicans, eastern US) poison oak (T diversilobium or Rhus diversiloba, western US), poison sumac (T vernix, southern US)
Public health A popular term for any allergic reaction or dermatopathy caused by T radicans, as in ‘Bob has poison ivy’
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

poison ivy

1. A plant that is highly allergenic due to urushiol, which is also found in mango, japanese lacquer tree, cashews; common urushiol-rich plants: poison ivy–Toxicodendron radicans, eastern US, poison oak–T diversilobium or Rhus diversiloba, western US; poison sumac–T vernix, southern US. See Urushiol.
2. A popular term for any allergic reaction or dermatopathy caused by T radicans.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

poi·son i·vy

, poison oak , poison sumac (poy'zŏn ī'vē, ōk, sūmak)
2. Common name for the cutaneous eruption caused by contact with these species of Toxicodendron.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
10.0 2.4 4 1.0 1.0 Poa pratensis 6.7 1.6 12 3.0 1.0 Amorpha canescens 6.7 1.6 -- -- -- Cornus drummondii 6.7 1.6 14 3.4 5.1 Chamaecrista fasciculata 3.3 0.8 -- -- -- Pycnanthemum tenuifolium 3.3 0.8 -- -- -- Bouteloua hirsuta 3.3 0.8 -- -- -- Solidago nemoralis 3.3 0.8 -- -- -- Prunus serotina 3.3 0.8 -- -- -- Toxicodendron radicans -- -- 48 11.8 23.4 Ageratina altissima -- -- 52 12.8 16.0 Carex pensylvanica -- -- 36 8.9 6.6 Carex sp.
Parthenocissus quinquefolia, Toxicodendron radicans and Vitis riparia are also common.
Common vines at the three sites were Vitis riparia Michx., Toxicodendron radicans (L.) Mill., Parthenocissus quinquefolia (L.) Planch., and Berchemia scandens (Hill) K.
As a result of these human interventions, this old-field is an "exotic species paradise." Woody species occurring at this site that are common to abundant include Ailanthus altissima, Gleditsia triacanthos, Lonicera maackii, Morus alba, Toxicodendron radicans ssp.
9 7.3 Prunus serotina 6 7.1 Shrub Layer Frangula alnus 13 26.0 Viburnum dentatum 8 19.3 Ulmus americana--saplings 3 6.4 Herb Layer Frangula alnus--seedlings 7 8.1 Rhamnus cathartica--seedlings 3 3.9 Toxicodendron radicans 1 3.2 Mixed Hardwood Forest--7 plots Tree Layer Ostrya virginiana 7 22.4 Fagus grandifolia 4 21.3 Fraxinus americana 4 11.9 Shrub Layer Fagus grandiJblia--saplings 3 3.1 Carya cordiformis--saplings 2 2.9 Ulmus americana--saplings 1 2.9 Herb Layer Toxicodendron radicans 3 20.0 Podophyllum peltatum 2 2.4 Potentilla simplex 1 1.4 TABLE 2 List of invasive species present at Shaker Median Park.
In the forest, if a randomly selected subplot contained high concentrations of Toxicodendron radicans (poison ivy), the plot was moved to an area relatively free of this species.
Undergrowth was dominated by poison ivy (Toxicodendron radicans), Virginia creeper (Parthenocissus quinquefolia), garlic mustard (Alliaria petiolata), mutiflora rose (Rosa multiflora) and Amur honeysuckle (Lonicera maackii).
Toxicodendron radicans (L.) Kuntze subsp, negundo (Greene) Gillis; Common or Eastern Poison Ivy; C = 1; BSUH 16524; 16631; 16409.
Vines of Toxicodendron radicans and Parthenocissus quinquefolia were present.
400 22750 -- -- Ostrya virginiana 300 -- Toxicodendron radicans 300 125 -- -- Celastrus scandens 200 625 -- -- Celtis occidentalis 200 875 -- -- Malus ioensis 200 -- -- -- Carya ovata 200 750 -- -- Rubus occidentalis 100 -- -- -- Symphoricarpos orbiculatus -- 1875 -- -- Ribes missouriense -- 125 -- -- Vitis vulpina -- 125 -- -- Total 32000 96000 100 -- Large saplings Species Area A Area B Acer saccharum 5 15 Prunus serotina -- -- Fraxinus lanceolata -- -- Carya glabra 5 -- Parthenocissus quinquefolia -- -- Rubus allegheniensis -- -- Quercus alba -- Cercis canadensis -- -- Quercus rubra Sassafras albidum -- -- Morus alba -- -- Ulmus spp.
Understory on most sites is very sparse and often includes poison ivy (Toxicodendron radicans), greenbriar (Smilax sp.) and grape (Vitis sp.).
The most commonly-encountered shrubs and woody vines are Humulus lupulus, Parthenoeissus quinquefolia, Rosa setigera, Smilax spp., Toxicodendron radicans, Viburnum prunifolium, and Vitis spp.