[NAFEX] Poison Oak question

tanis grif tanisgrif at yahoo.com
Sun May 13 10:43:21 EDT 2007


Doesn't publicity for incorrect plant IDs make you mad?!  Especially re the edibles
& toxics!  

I think there is so much mis-info re p.ivy & p.oak ID that it doesn't matter whether
we split this hair.  P.oak may have originally meant the species/ subsps/ varient
which grows better in Med climate-- found west of Sierras and looks a little dif
than the rest of the continent's p.ivy.  But now any p.ivy stem w/ a slightly more
lobed leaflet will cause arguments about it being p.oak.

I don't think height is species dif.  Here, what looks to me like the same stuff
otherwise, can be found in-- 
shadey woods, low vigor rhizomatous vine biding time for a shot of more sun;
full sun, low thickets of a range of densities, 6" tall to 4" tall;
a vine climbing a tree-trunk via many hairy rootlets (VI creeper vine looks
similar--except for it's 5 leaflets-- especially in dormant season), I've seen vines
2" diameter.


--- 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?
> 
>


       
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