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Richard, WV recognizes several species/vars. of poison ivy (all once Rhus radicans). Original WV Flora says "innumerable forms of a perplexingly variable species."</div>
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Virginia flora & other new treatments have keys to the segregates, which are distinguished by leaf margin, adventitious roots/climbing (vs. shrubby), pubescence, etc.<br>
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<div>Donna Ford-Werntz, Ph.D.<br>
Service Professor/Herbarium Curator<br>
Biology Dept., Box 6057<br>
Life Sci. Bldg., 53 Campus Dr.<br>
West Virginia Univ.<br>
Morgantown, WV 26506<br>
304-293-0794; biology.wvu.edu</div>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size: 11pt; color: rgb(0, 0, 0);" face="Calibri, sans-serif"><b>From:</b> MAIPC <maipc-bounces@lists.maipc.org> on behalf of Richard Gardner <rtgardner3@yahoo.com><br>
<b>Sent:</b> Saturday, June 17, 2023 9:27 AM<br>
<b>To:</b> MAIPC Listserve <maipc@lists.maipc.org>; Listserv Umd Listserv <listserv@listserv.umd.edu><br>
<b>Subject:</b> [MAIPC] poison ivy identification question</font>
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<div dir="ltr" data-setdir="false">I have been around poison ivy all my life and had at least one case of dermatitis from it every year. So I instinctively know what it looks like dormant, as a vine and most other forms. However, in the last week it hit home
that there appears to be at least 2 different leaf shapes - a toothed/serrate leaf growing on the ground and a smooth margin when growing on trees. Am I correct?</div>
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<div dir="ltr" data-setdir="false">Do we have poison oak growing in the mid-Atlantic? This question is what made me question the various forms of poison ivy. I know that according to theory the closer to an area that an organism evolves in the more diversity
in form. In languages the original home of a language can be found by the diversity of words for a concept.</div>
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<div dir="ltr" data-setdir="false">One interesting experience I have had with poison ivy is that when cutting thick vines on a tree with an axe the axe rang like a bell.</div>
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<div dir="ltr" data-setdir="false">I use jewelweed (Impatiens capensis) fresh or preserved in isopropanol to reduce contact dermatitis. If I know that I have the urushiol oil on me I try to find a flowing stream and wash it off. When I get home or to a faucet
I wash (hose off) exposed skin thoroughly. All clothing that has been in contact with it is turned inside out and washed several times. I dust my shoes with baby powder or any easily available fine powder such as white flour to absorb the urushiol.</div>
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<div dir="ltr" data-setdir="false"> Richard Gardner</div>
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