Plant ID forum: Poison ivy?

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Southern Quebec (Zone 5b)
mrperrier
Jun 6, 2016 5:43 PM CST
Can anyone confirm?
Thumb of 2016-06-06/mrperrier/6126e4


Thumb of 2016-06-06/mrperrier/517d23

Name: Porkpal
Richmond, TX
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porkpal
Jun 6, 2016 6:25 PM CST
It does not look like poison ivy to me.
Porkpal
Name: Jay
Nederland, Texas (Zone 9a)
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Horntoad
Jun 6, 2016 6:48 PM CST
Me either.
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Name: Sue
Ontario, Canada (Zone 4a)
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sooby
Jun 6, 2016 8:09 PM CST
Check out the fifth picture on this page:

http://www.poison-ivy.org/unusual-poison-ivy

I haven't seen poison ivy look like that but I would treat it with caution. Is there any more "conventional" looking poison ivy close by?
Name: Jay
Nederland, Texas (Zone 9a)
Region: Texas Region: Gulf Coast Charter ATP Member I helped beta test the first seed swap I helped plan and beta test the plant database. I was one of the first 300 contributors to the plant database!
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Horntoad
Jun 6, 2016 8:17 PM CST
sooby said:Check out the fifth picture on this page:

http://www.poison-ivy.org/unusual-poison-ivy

I haven't seen poison ivy look like that but I would treat it with caution. Is there any more "conventional" looking poison ivy close by?


Good advice.
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Southern Quebec (Zone 5b)
mrperrier
Jun 6, 2016 8:23 PM CST
I noted that it had unconventional toothed leaves, but I was reading that there are variants with such leaves. No, as far as I know, there are no other poison ivy plants around. I have no idea where this came from...

Are there any other viable candidates for this plant? I'm thinking I will likely remove it with caution no matter what.
Name: Sue
Ontario, Canada (Zone 4a)
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sooby
Jun 7, 2016 5:08 AM CST
To try and ID it can you check without touching it whether the compound leaves are opposite or alternate and confirm whether it is growing in the wild, a weed in a garden or some other situation? If there 's no other poison ivy, is there any more of this plant with toothed leaf edges?
Name: Feng Xiao Long
Bogor, Java, Indonesia (Zone 13a)
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XiaoLong
Jun 7, 2016 6:57 AM CST
Looks like a kind of Cissus to me. Cissus rhombifolia?

Name: Sue
Ontario, Canada (Zone 4a)
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sooby
Jun 7, 2016 7:05 AM CST
In the top picture the leaves appear to be alternate. Assuming a wild plant that, according to my field guide, narrows it down to poison ivy or possibly fragrant sumac (Rhus aromatica). None of the other alternate leaved plants with three leaflets that fit can be vines. The long petiole on the end leaflet of poison ivy is long, the end leaflet on fragrant sumac tapers towards its base. In the ID plant that distinction is rather ambiguous. Another difference is that poison ivy produces aerial rootlets whereas fragrant sumac does not. Since we can't see the older stems in the pictures that's something you could look for lower down on the stem.

Cissus rhombifolia would not be growing wild in Quebec. Edited to add there is a Cissus incisa but it doesn't look like a match and the range given in my field guide does not go as far north as Quebec. It differs from poison ivy also in not having aerial roots.
[Last edited by sooby - Jun 7, 2016 7:10 AM (+)]
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Name: Rick R.
near Minneapolis, MN zone 4a
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Leftwood
Jun 7, 2016 4:09 PM CST
Poison ivy has smooth and glossy leaves. The plant in question has neither. The vein structure is also different between the two.

I think it is just Boston ivy (Parthenocissus tricuspidata)
http://landscaping.about.com/od/galleryoflandscapephotos/ig/...



Name: Sue
Ontario, Canada (Zone 4a)
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sooby
Jun 7, 2016 5:35 PM CST
According to this Michigan State University page poison ivy leaves can be shiny or dull but I must admit the ID plant doesn't look smooth although nor does the poison ivy with teeth in the earlier link above. Parthenocissus tricuspidata apparently rarely naturalizes (at least in the north) and I haven't seen it listed as having done so in Quebec. It could have been planted though. I do see P. quinquefolia naturalized around here regularly but have never seen P. tricuspidata other than in gardens and then not very often.

http://msue.anr.msu.edu/news/identifying_poison_ivy_isnt_alw...

Interesting possibility though, I didn't realize the leaves were trifoliate in younger plants and became simple but lobed on older plants. For some reason my field guide completely ignored Parthenocissus even though P. quinquefolia is common in this area (can see Quebec from higher ground just up the road).
Southern Quebec (Zone 5b)
mrperrier
Jun 7, 2016 7:39 PM CST
I should clarify that this plant was not planted, and was not present last summer.
Name: Heath
sevierville TN (Zone 7a)
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plantcollector
Jun 7, 2016 8:02 PM CST
I am allergic to poison ivy I live with it most of the summer. I get it in little spots here and there on my arms and fingers if I'm not sure what it is I would just touch it to my forearm and see if I get it. Now I wouldn't do that if you are the type of person that has to go to the hospital when you get it. If you get a small rash on your forearm just get some Benadryl lotion and rub on it. Just a suggestion Whistling
Name: John
Scott County, KY (Zone 5b)
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ViburnumValley
Jun 7, 2016 10:53 PM CST
Parthenocissus tricuspidata - no question. Good call, Rick.

sLOVEnia rocks...
John
Name: Sue
Ontario, Canada (Zone 4a)
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sooby
Jun 8, 2016 3:24 AM CST
mrperrier said:I should clarify that this plant was not planted, and was not present last summer.


Is there any Boston ivy growing in the vicinity, such as on a house wall?

Name: Rita
North Shore, Long Island, NY
Zone 6B
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Newyorkrita
Jun 13, 2016 4:44 PM CST
Thumb of 2016-06-13/Newyorkrita/6bff2a

Here is a picture from my yard. Plant in the middle is poison ivy. Most of the plants around it are just Boston ivy. Lots of Boston ivy tries to grow around here and I am yanking it out.
Name: Sue
Ontario, Canada (Zone 4a)
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sooby
Jun 13, 2016 5:01 PM CST
Rita, that's Virginia creeper because it has five leaflets. Boston ivy either has three leaflets or a single leaf with three lobes. Both are Parthenocissus though (P. quinquefolia versus P. tricuspidata).
Name: Rita
North Shore, Long Island, NY
Zone 6B
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Newyorkrita
Jun 13, 2016 5:04 PM CST
sooby said:Rita, that's Virginia creeper because it has five leaflets. Boston ivy either has three leaflets or a single leaf with three lobes. Both are Parthenocissus though (P. quinquefolia versus P. tricuspidata).


Oh yes, now I realize you are of course right. Don't know what I was thinking calling it Boston Ivy. The Virginia Creeper grows on the back of my neighbors garage.

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