[NAFEX] Poison Oak question

Jim Fruth jfruth at tds.net
Sun May 13 10:22:10 EDT 2007

    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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