eastern poison ivy

(Toxicodendron radicans ssp. negundo)

               
Conservation Status

IUCN Red List

not yet assessed

 

No image available

NatureServe

N5 - Secure

SNR - Unranked

Minnesota

not listed

Wetland
Indicator
Status

Great Plains

FACU - Facultative upland

Midwest

FAC - Facultative

Northcentral & Northeast

FAC - Facultative

Weed Status

SN – State noxious weed

Specially Regulated

Nativity

Native

Occurrence

 

Habitat

Woods, wood edges, wooded flood plains. Light shade to full sun.

Flowering

June to August

     
Flower Color

Yellowish green

     
Height

10 to 36

     

Identification

This is a climbing or trailing, perennial, woody vine that rises from a usually underground rhizome. It often forms colonies.

Stems are woody and produce abundant, centipede-like aerial roots that grasp the host tree.

Leaves are alternate on long, slender, densely hairy leaf stalks.

The leaves are divided into 3 leaflets. The leaflets may be egg-shaped, with the broad portion at the base where it attaches to the leaf stalk, or elliptic, broadest in the middle and tapering toward both ends. They taper to a point at the tip. They are 1 to 6 long. The two side leaflets are usually shorter than the central leaflet. The leaflet margins may have shallow lobes, they may have rounded teeth, or they may be entire. They tend to be flat, not folded along the midrib. Young leaves are reddish-purple, becoming somewhat shiny and greed with maturity. In the fall the leaves turn yellow, orange, or bright red.

Black spots may appear on any part of the plant. The spots are urushiol, the resin that causes allergic reactions. When the plant is damaged urushiol is exuded in an attempt to seal off the damaged area. The resin is creamy, turning brown-red then black with oxidation.

The inflorescence is a 3 to 4 long cluster with usually more than 25 flowers. The flower has 5 yellowish green petals.

The fruit is a smooth, dull white berry with a few gray stripes. The fruit cluster is stalked and hangs downward.

 
Similar
Species

Western poison ivy (Toxicodendron rydbergii) is a shrub, not a vine. It does not climb trees. The stems do not have aerial roots. The leaf stalks are hairless. The leaflets tend to be folded slightly along the midrib, not flat. The inflorescence is 4 to 16 long. The fruit cluster is compact and erect.


Distribution Range Map – eastern poison ivy  

Sources: 2, 3, 4, 5, 7, 8, 28.

BONAP2 shows this species distributed throughout the state and occurring in most counties. All other sources show a much more restricted range. The map at left does not include the BONAP data.


Comments

Toxicity
Contact with the outer surface on an undamaged plant should not cause an allergic reaction unless there is residual urushiol present from a previous injury to the plant or a nearby plant. Contact with a torn leaf, broken or damaged stem or rhizome, or black spot will cause a reaction in those sensitized to urushiol. Several exposures to the substance may be necessary to impart sensitivity. Research has shown that 85% of all people will develop contact dermatitis after adequate exposure. It usually takes 12 to 48 hours for a rash to develop on a previously sensitized person. In some individuals, a single exposure will cause a reaction. In these individuals, the rash will develop in seven to ten days. The lesions last 14 to 20 days. Rashes do not spread and are not contagious. Treatment can dry the blisters, reduce swelling, and relieve itching, but will not speed healing.


Taxonomy

Family:

Anacardiaceae (sumac)

 

Subfamily:

Anacardioideae

 
Synonyms

Toxicodendron radicans var. negundo

 
Common
Names

Common Eastern Poison-ivy

Common Poison-ivy

eastern poison ivy

Eastern Poison-ivy

Poison Ivy


 

 

 

 

 

 

 

 

 

 

 

Glossary

entire

Continuous; not toothed, notched, or lobed.

 

rhizome

A horizontal, usually underground stem. It serves as a reproductive structure, producing roots below and shoots above at the nodes.

 

urushiol

Collectively, the five chemicals (alkylcatechols) in the sap of Toxicodendrons that cause allergic reactions in humans.

       

Visitor Photos

   
Share your photo of this plant.

       
       
       
       

MinnesotaSeasons.com Photos

   
       
       
       

 

Camera

     

Slideshows

   
  Poison Ivy
Andree Reno Sanborn
 
  Poison Ivy  
 
About

Toxicodendron radicans

 
     
  Poison Ivy (Toxicodendron radicans)
Bill Keim
 
  Poison Ivy (Toxicodendron radicans)  
     
  Toxicodendron radicans (Poison-Ivy)
Allen Chartier
 
  Toxicodendron radicans (Poison-Ivy)  

 

slideshow

     

Visitor Videos

   
Share your video of this plant.

     
     

Other Videos

 
  toxicodendron radicans
josh veazey
 
   
 
About

Published on Apr 24, 2012

documentary on toxicodendron radicans

 
     
  Toxicodendron radicans (Poison Ivy)
Plantwalks
 
   
 
About

Published on Nov 17, 2012

He won't bring this to class.... would he?

 
     
  How to ID Poison Ivy: It's My Park Minute
NYC Parks
 
   
 
About

Published on Aug 21, 2013

Ghanim Khalil, an Urban Park Ranger with NYC Parks in Willowbrook Park, Staten Island, explains how to identify and avoid poison ivy, aka Toxicodendron radicans.

Subscribe to www.youtube.com/nycparksdepartment to learn more about NYC Parks.

Produced by Adrian Sas

 
     
  Poison Ivy Will DESTROY You
DNews
 
   
 
About

Published on Jun 16, 2013

Summer's here and with it comes more time outdoors. But be warned: some of those newly sprouted plants are out to get you! Namely, Poison Ivy! Trace shows us what makes this plant one of the wickedest out there.

Read More:

Beware America's Most Poisonous Plants
http://news.discovery.com/earth/plants/poisonous-plants-poison-ivy-oak-130617.htm.
"Common landscaping plants use lethal chemical warfare on unwary humans. Beware the following rogue's gallery of America's most unwanted weeds and felonious flowers."

Poison Ivy, Oak, or Sumac - Topic Overview
http://www.webmd.com/allergies/tc/poison-ivy-oak-or-sumac-topic-overview
"Poison ivy, poison oak, and poison sumac are plants that can cause a skin rash called allergic contact dermatitis when they touch your skin."

Outsmarting Poison Ivy and Other Poisonous Plants http://www.fda.gov/forconsumers/consumerupdates/ucm049342.htm
"First comes the itching, then a red rash, and then blisters."

Poison Ivy: Toxicodendron radicans
http://www.fcps.edu/islandcreekes/ecology/poison_ivy.htm
"Poison Ivy is one of the best-known, and probably the most-hated, plant in Virginia. Because most people are allergic to its sap, Poison Ivy can cause a nasty rash and blisters on the skin."

Poison Ivy
http://www.hort.purdue.edu/ext/HO-218.pdf
"Although poison ivy (Rhus radicans or Toxicodendron radicans) is easily identified and should be avoided, countless people experience a painful introduction to the species."

Irritating to Humans but Good for Wildlife
http://mdc.mo.gov/your-property/problem-plants-and-animals/nuisance-native-plants/poison-ivy-control
"Poison ivy is a woody shrub or vine with hairy-looking aerial roots."

Giant, Toxic Weed Poses Health Risk
http://news.discovery.com/earth/plants/giant-hogweed-invasive-plant-110719.htm
"The sap of the giant hogweed is extremely poisonous, with the potential to cause burns and even blindness."

Watch More:
Plants Can Hear: http://www.youtube.com/watch?v=ApZ59MSty4o
Glowing Plants: http://www.youtube.com/watch?v=QMDiRKootnI
Vines Hate You: http://www.youtube.com/watch?v=IwPwBaaLCzE

 
     
  Poison Ivy
ExploringWithGeorge
 
   
 
About

Published on Jul 28, 2013

If you spend time in the outdoors you are going to run into poison Ivy

Toxicodendron radicans, commonly known as poison ivy, is a poisonous North American plant that is well known for its production of urushiol, a clear liquid compound found within the sap of the plant ... Wikipedia

 
     

 

Camcorder

         

Visitor Sightings

   
Share your sighting of this plant.

     
     
 

MinnesotaSeasons.com Sightings

   


 

 

Binoculars

Last Updated:

About Us | Privacy Policy | Contact Us | © 2017 MinnesotaSeasons.com. All rights reserved.