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Poison Hemlock
Apiaceae (=
Umbelliferae), the parsnip family
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Background
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 Poison
hemlock is native to Europe. It contains highly poisonous alkaloids toxic to
all classes of livestock and humans. It has poisoned many who have mistaken
it for parsley. Poison hemlock is often found on poorly drained soils,
particularly near streams, ditches, and surface water.
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Description
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 Poison
hemlock is a biennial that grows up to 10 feet
tall. Stems are stout, hollow, ridged, and mottled with purple spots. Leaves
are shiny green, 3 to 4 times pinnately compound, and
clasp the stem at the
obvious nodes. Crushed foliage has a disagreeable, mousey odor. Flowers are
small, white, and borne in umbrella-shaped clusters about 3 inches across
in early summer. Seeds are ridged and flattened, with 2 seeds borne
together. The plant has a thick, white
taproot.
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Distribution
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 It
grows throughout the U.S. except from eastern Montana to northeastern
Minnesota and south to Nebraska. It has an extensive presence in Idaho. |
Control
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A biological control agent (a
defoliating moth) provides good to excellent but inconsistent control.
Herbicides are also available.
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© 1999 University of Idaho:
Text and photographs for these pages from Idaho's Noxious Weeds, by
Robert H. Callihan and Timothy W. Miller (revised by Don W. Morishita
and Larry W. Lass).
Please contact: Ag Publishing, University of Idaho, Moscow,
Idaho 83844-2240; 208 882-7982 visit the Resources for Idaho website at
http://info.ag.uidaho.edu, for more information about this or other
publications.
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Home » Weed Department
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Reid Smith
Weed Superintendent
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Since the Weed Superintendent
may be out doing field work, he may not be available to answer your call.
Please leave a message and he will return your call as soon as possible. |
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Weed Department Secretary |
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Diana Wheeler
Weed Dept. Secretary |
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Weed Advisory
Board Members |
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Chairman |
Carl Bailey |
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John Remsberg III |
Pat O’Donnnell |
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Mike Patterson |
Mike Larson |
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Marty Rochford |
Kevin Harper |
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Minidoka County Noxious Weeds |
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Noxious Weeds:
The Cancer of our Land
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Control and managing noxious weeds in the State of Idaho requires and
understanding of the problem, and that begins with detection and
identification of noxious weeds. |
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Weeds cost millions of dollars to our State by:
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degrading wildlife habitat,
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choking steams and waterways,
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Crowding out beneficial native plants,
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creating fire hazards in our forests and on
our ranges,
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poisoning and injuring livestock and
humans, and
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fouling recreation sites from use.
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The spread of noxious weeds may signal the decline of entire ecological
watersheds. They severely impact the beauty and widespread economic losses.
Weeds are problems for urban as well as rural areas, and for private, state,
and federal lands. Noxious weed species spare no segment of
society--rancher, fisher, and biker alike--and when unmanaged they spread
rapidly, unceasingly, and silently.
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Noxious weeds pose a serious threat to all Idahoans and to the land we call
home. |
Patrick A. Takasugi, Director
Idaho Department of Agriculture
Booklets available with information about the 36 noxious weeds in Idaho
Stop by and pick one up!
University of
Idaho--Cooperative Extension System |
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Office Information |
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120 South 400 West
Rupert, Id 83350. |
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Phone: (208)438-8195
Fax: (208)438-8195 |
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Other Information |
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