Toxicodendron radicans (Anacaridiaceae)
Weed ID Links
Roots: Reddish and branching
Photo from: http://res2.agr.ca/ecorc/poison/radicans_e.htm
Stems/Leaves: The leaves are large, and three parted.
The central leaflet has a longer stalk. The leaves are around 4 inches
long at full growth. (5)
Flowers: The flowers have five green petals that unite at
the base. (3)
Fruits/Seeds: The fruits is an uncolored small berry (5)
Methods of Reproduction: Spreads by seed. (2)
Montana Infestation: Infests all of Montana. (4)
Environments of Infestations: It infests the south eastern
part of the United States the most. (4)
Comments: This plant contains urushiol, this oil
will cause allergic reactions to over half the United States population.
Impacts: If you come in contact with this plant you will develop
a rash and other symptoms. (1)
Native Range: This plant is all over the United States and
the lower part of Canada. There are many different types but almost every
part of the United
States is effected by at least one type of this plant. (5)
Methods of control: Some methods of control for poison ivy
are herbicides such as Roundup. Poison Ivy can
also be mowed on a regular basis, as a form of control.
If you pull poison ivy this will also rid the area. Mulching and
covering the plant with a tarp are also
used to control the plant. (3)
How to Prevent Spread: To prevent spread you can use goats,
these eat the plant so they do not spread. Also, you can mow
the plant. (2)
1). Mulligan, G.A.; Junkins, B.E. 1977. The biology of Canadian
weeds. 23. Rhus radicans L. Can. J. Plant Sci. [online] available: http://res2.agr.ca/ecorc/poison/radicans_e.htm,
2). Dunphry, Jim, Poison Ivy. [online] available:
3). Unknown, OutdoorPlaces.Com, [online] available:
4). Unknown, University of Maryland Medicine, [online]
5). Burrill, Larry, et. al, Weeds of the west,
Published by The Western Society of Weed Science, 1996.
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By: Robert Barnosky, 5/2004.