[NAFEX] Poison Oak question

Regina M. Kreger regina at kreger.net
Sun May 13 11:58:48 EDT 2007

Around here (Maryland), poison ivy can grow 50' high if it's got 
something to climb that high.  I've seen it with 3"+ diameter trunks.

Jim Fruth wrote:

>    Several years ago I visited Itasca State Park and pictures of Poison Ivy 
>and Poison Oak were displayed for public viewing.  The picture for "Poison 
>Oak" was really Virginia Creeper (Parthenocissus quinquefolia).
>    My botanical keys, Britton & Brown, lists Poison Ivy and Poison Oak as 
>separate species separated mostly by leaf shape.  I've seen both leaf shapes 
>on the same plant. From my experience, I would challenge the idea of their 
>being separate species. I have traveled most of these United States and have 
>encountered only one plant that could, perhaps, be a separate species.  It 
>was a California Poison Ivy that grew 12 to 15 ft. high, unlike its more 
>common cousin(?) that grows to about 2' high.
>    What is your experience on this subject?
>Jim Fruth
>Brambleberry Farm
>Pequot Lakes, MN  56472
>(218)568-8483 [Store]
>(218)831-7018 [My Cell] 
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