North American Fruit Explorers mailing list at ibiblio

["Regina M. Kreger" <regina@kreger.net>]

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
> www.bberryfarm.com
> (218)568-8483 [Store]
> (218)831-7018 [My Cell] 
>
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