Conium maculatum L.
POISON HEMLOCK
  Dicotyledoneae   Apiaceae   Conium

Conium maculatum, Poison Hemlock
© Copyright Sheryl Pollock 2011 · 8
Conium maculatum, Poison Hemlock

Click on map or images to enlarge.
 
Conium maculatum
© Copyright Bobby Hattaway 2011 · 5
Conium maculatum

Conium maculatum
© Copyright Bobby Hattaway 2011 · 5
Conium maculatum

Conium maculatum
© Copyright Bobby Hattaway 2011 · 5
Conium maculatum

Conium maculatum
© Copyright Bobby Hattaway 2011 · 5
Conium maculatum

Conium maculatum
© Copyright Bobby Hattaway 2011 · 5
Conium maculatum
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IDnature guide
Names
Scientific source:

Supported by
Associates · map
FamilyScientific name @ source (records)
Andrenidae  Andrena crataegi @ BBSL (1)

Andrena cressonii @ BBSL (2)

Andrena mariae @ I_ADG (1)

Andrena prunorum @ BBSL (1)
Aphididae  Cavariella ( @ AMNH_PBI (4)

Cavariella pastinacae @ AMNH_PBI (1)

Dysaphis ( @ AMNH_PBI (1)

Hyadaphis foeniculi @ AMNH_PBI (16)
Apidae  Eucera edwardsii @ BBSL (1)
Braconidae  Lysiphlebus ( @ AMNH_PBI (17)
Cicadellidae  Empoasca ( @ UCR_ENT (9)
Coccidae  Parasaissetia nigra @ CSCA_TCN (1)
Coccinellidae  Harmonia axyridis @ I_LB (1)
Diaspididae  Lepidosaphes ulmi @ UCR_ENT (1)
Halictidae  Halictus tripartitus @ BBSL (2)
Miridae  Diomocoris @ UNSW_ENT (2)

Lygus hesperus @ AMNH_PBI (1)

Orthops scutellatus @ AMNH_PBI (2)
Reduviidae  Nalata @ AMNH_PBI (1)

Opisthacidius @ AMNH_PBI (1)

Phymata severini @ AMNH_PBI (3)

Pseudozelurus arizonicus @ AMNH_PBI (7)

Reduvius senilis @ AMNH_PBI (1)

Zelurus americanus @ AMNH_PBI (3)
Syrphidae  Copestylum marginatum @ I_ADG (1)
Tachinidae  Gymnosoma rotundatum @ I_ADG (1)
_  Euscelidius variegatus @ UCR_ENT (2)

unknown unknown @ AMNH_PBI (18)

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&pull 20q v4.662 20091102: Error 403 Forbidden http://wiki.bugwood.org/Conium_maculatum/

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Delaware Wildflowers  •  Scientific names

Conium maculatum L. Poison-hemlock
Apiaceae — Carrot family
Invasive non-native
Conium maculatum
Brandywine Creek State Park
May 2002

More information on this plant, from other sources.


Copyright David G. Smith

Delaware Wildflowers main page

Following modified from MissouriPlants.com
   
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Conium maculatum L. - Poison Hemlock

Conium maculatum plant

Family - Apiaceae

Stems - To 3m tall, herbaceous, green with purple or black spots, sometimes entirely purple, often glaucous, glabrous, erect, from large taproot.

Conium maculatum stem Stem.

Leaves - Alternate, large, to 40cm long, about as broad as long, ternate, glabrous, broadly ovate in outline. Leaflets pinnatifid. Lobes serrate.

Conium maculatum leaf

Inflorescence - Multiple compound umbels terminating the stems. Umbels and umbellets subtended by attenuate bracts to 5mm long. Rays glabrous. Flowers +/-15 per umbellet.

Conium maculatum inflorescence

Flowers - Petals 5, white, subequal but typically with one petal larger than the others, glabrous, to 1.2mm long, 1mm broad, cuneate at base. Apex of petal apiculate with the apiculus curving adaxially. Margins of petal folding slightly downward. Stamens 5, alternating with petals. Filaments to 1mm long, white, glabrous. Anthers pale yellow to whitish, .15mm broad. Stylopodium present, slightly flattened, greenish.

Conium maculatum flowers Flowers close-up.

Flowering - May - August.

Habitat - Waste groung, disturbed sites, pastures, open fields, low ground, railroads, roadsides.

Origin - Native to Europe.

Other info. - Although this plant may smell like fennel ( Foeniculum sp. ) , or Finocchio in Italian, when bruised or crushed, it should not be eaten as it is very toxic.
No other species in the family has such large and divided leaves as C. maculatum , so the plant can be easily distinguished from a distance. It is a very common weed in Missouri.

Photographs taken at the Kansas City Zoo, 5-22-00, and in Eminence, MO., 6-6-03.



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You are here: Home / Plant Profile

Conium maculatum L.
poison hemlock

Image of Conium maculatum

General Information
Symbol: COMA2
Group: Dicot
Family: Apiaceae
Duration: Biennial
Growth Habit : Forb/herb
Native Status : CAN   I
L48   I
Data Source and Documentation
About our new maps
Plants-NRCS Logos
green round image for nativity Native blue round image for introduced Introduced ocre round image for introduced and nativity Both white round image for no status Absent/Unreported
image for native, but no county data Native, No County Data image for introduced, but no county data Introduced, No County Data both introduced and native, but no county data Both, No County Data
Native Status:
lower 48 status L48    Alaska status AK    Hawaii status HI    Puerto Rico status PR    Virgin Islands status VI    Navassa Island NAV    Canada status CAN    Greenland status GL    Saint Pierre and Michelon status SPM    North America NA   

Images

click on a thumbnail to view an image, or see all the Conium thumbnails at the Plants Gallery

William & Wilma Follette. USDA NRCS. 1992. Western wetland flora: Field office guide to plant species . West Region, Sacramento. Provided by USDA NRCS Wetland Science Institute (WSI). Usage Requirements .

Brother Alfred Brousseau. Provided by St. Mary's College of California . ©St. Mary's College of California. Usage Requirements .

Steve Hurst. Provided by ARS Systematic Botany and Mycology Laboratory . United States, NV. Usage Requirements .

Patrick J. Alexander. Usage Requirements .

Patrick J. Alexander. Usage Requirements .

©Gary A. Monroe. United States, NV, Washoe Co. 2002. Usage Requirements .

Doug Goldman. Provided by USDA NRCS National Plants Data Team (NPDT) . United States, NC, Guilford Co., Greensboro. July 7, 2011. Usage Requirements .

Doug Goldman. Provided by USDA NRCS National Plants Data Team (NPDT) . United States, NC, Guilford Co., Greensboro. July 7, 2011. Usage Requirements .

Doug Goldman. Provided by USDA NRCS National Plants Data Team (NPDT) . United States, NC, Guilford Co., Greensboro. April 6, 2012. Usage Requirements .

Doug Goldman. Provided by USDA NRCS National Plants Data Team (NPDT) . United States, NC, Guilford Co., Greensboro. April 6, 2012. Usage Requirements .

Doug Goldman. Provided by USDA NRCS National Plants Data Team (NPDT) . United States, NC, Guilford Co., Greensboro. May 21, 2012. Usage Requirements .

Doug Goldman. Provided by USDA NRCS National Plants Data Team (NPDT) . United States, NC, Guilford Co., Greensboro. May 21, 2012. Usage Requirements .

Doug Goldman. Provided by USDA NRCS National Plants Data Team (NPDT) . United States, NC, Guilford Co., Greensboro. May 25, 2011. Usage Requirements .

Doug Goldman. Provided by USDA NRCS National Plants Data Team (NPDT) . United States, NC, Guilford Co., Greensboro. May 25, 2011. Usage Requirements .

Doug Goldman. Provided by USDA NRCS National Plants Data Team (NPDT) . United States, NC, Guilford Co., Greensboro. May 25, 2011. Usage Requirements .

Doug Goldman. Provided by USDA NRCS National Plants Data Team (NPDT) . United States, NC, Guilford Co., Greensboro. May 25, 2011. Usage Requirements .

Doug Goldman. Provided by USDA NRCS National Plants Data Team (NPDT) . United States, NC, Guilford Co., Greensboro. May 25, 2011. Usage Requirements .

Doug Goldman. Provided by USDA NRCS National Plants Data Team (NPDT) . United States, NC, Guilford Co., Greensboro. May 25, 2011. Usage Requirements .

Doug Goldman. Provided by USDA NRCS National Plants Data Team (NPDT) . United States, NC, Guilford Co., Greensboro. May 25, 2011. Usage Requirements .

Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York. Vol. 2: 653. Provided by Kentucky Native Plant Society . Scanned by Omnitek Inc . Usage Requirements .

USDA NRCS. Wetland flora: Field office illustrated guide to plant species. USDA Natural Resources Conservation Service. Provided by NRCS National Wetland Team . Usage Requirements .

slideshow

Synonyms

Classification

Click on a scientific name below to expand it in the PLANTS Classification Report.
Rank Scientific Name and Common Name
Kingdom Plantae – Plants
Subkingdom Tracheobionta – Vascular plants
Superdivision Spermatophyta – Seed plants
Division Magnoliophyta – Flowering plants
Class Magnoliopsida – Dicotyledons
Subclass Rosidae
Order Apiales
Family Apiaceae ⁄ Umbelliferae – Carrot family
Genus Conium L. – poison hemlock
Species Conium maculatum L. – poison hemlock

Subordinate Taxa

This plant has no children

Legal Status

Noxious Weed Information
This plant is listed by the U.S. federal government or a state. Common names are from state and federal lists. Click on a place name to get a complete noxious weed list for that location, or click here for a composite list of all Federal and State Noxious Weeds .
Colorado poison hemlock C list (noxious weeds)
Idaho poison hemlock Noxious weed
Iowa poison hemlock Secondary noxious weed
Nevada poison hemlock Noxious weed
New Mexico poison hemlock Class B noxious weed
Ohio poison hemlock Prohibited noxious weed
Oregon poison hemlock "B" designated weed poison hemlock Quarantine
Washington poison hemlock Class C noxious weed
U.S. Weed Information
Conium maculatum cigue maculee cigue tachetee deadly hemlock poison hemlock poison parsley This plant can be weedy or invasive according to the authoritative sources noted below.This plant may be known by one or more common names in different places, and some are listed above. Click on an acronym to view each weed list, or click here for a composite list of Weeds of the U.S.
STATE Assorted authors. State noxious weed lists for 46 states . State agriculture or natural resource departments.
Cal-IPC California Invasive Plant Council. 2006. California Invasive Plant Inventory. Cal-IPC Publication 2006-02 (1 February 2007). California Invasive Plant Council. Berkeley, California.
KY Haragan, P.D.. 1991. Weeds of Kentucky and adjacent states: a field guide . The University Press of Kentucky. Lexington, Kentucky.
N'EAST Uva, R.H., J.C. Neal,and J.M. DiTomaso. 1997. Weeds of the Northeast . Cornell University Press. Ithaca, New York.
NE&GP Stubbendieck, J., G.Y. Friisoe,and M.R. Bolick. 1994. Weeds of Nebraska and the Great Plains . Nebraska Department of Agriculture, Bureau of Plant Industry. Lincoln, Nebraska.
SEEPPC Southeast Exotic Pest Plant Council. 1996. Invasive exotic pest plants in Tennessee (19 October 1999). Research Committee of the Tennessee Exotic Pest Plant Council. Tennessee.
SWSS Southern Weed Science Society. 1998. Weeds of the United States and Canada. CD-ROM . Southern Weed Science Society. Champaign, Illinois.
WSWS Whitson, T.D. (ed.) et al.. 1996. Weeds of the West . Western Society of Weed Science in cooperation with Cooperative Extension Services, University of Wyoming. Laramie, Wyoming.

Wetland Status

Interpreting Wetland Status

North America
Arid West FACW
Atlantic and Gulf Coastal Plain FACW
Eastern Mountains and Piedmont FACW
Great Plains FACW
Midwest FACW
Northcentral & Northeast FACW
Western Mountains, Valleys, and Coast FAC

Related Links

More Accounts and Images
ARS Germplasm Resources Information Network (COMA2)
CalPhotos (COMA2)
Integrated Taxonomic Information System (COMA2)
Jepson Interchange (University of California - Berkeley) (COMA2)
Native American Ethnobotany (University of Michigan - Dearborn) (COMA2)
University of Tennessee Herbarium (Distribution) (COMA2)
University of Washington Burke Museum (COMA2)
University of Wisconsin - Stevens Point Freckmann Herbarium (COMA2)
Related Websites
Canada-Ontario Noxious Weeds (COMA2)
Idaho One Plan: noxious abstract & images (COMA2)
NV-Extension Weed Wanted Posters (COMA2)
New Zealand Environment Bay of Plenty: abstract & images (COMA2)
Texas A&M: Vascular Plant Image Gallery (COMA2)
The Nature Conservancy: Wildland Weeds Management & Research Program (COMA2)
Victoria - Natural Resources & Environment: Landcare Notes (COMA2)
Virginia: abstract & image (COMA2)

Wildlife

Food

Source Large Mammals Small Mammals Water Birds Terrestrial Birds

Cover

Source Large Mammals Small Mammals Water Birds Terrestrial Birds

Description of Values

Value Class Food Cover


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Following modified from CalPhotos
   
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CalPhotos     Photo Database

 

Number of matches : 83
Query: SELECT * FROM img WHERE ready=1 and taxon like "Conium maculatum%" and (lifeform != "specimen_tag" OR lifeform != "Plant") ORDER BY taxon

Click on the thumbnail to see an enlargement

Conium maculatum
Conium maculatum
Poison Hemlock
ID: 0175 3301 2283 0013 [detail]
© 2001 CDFA

Conium maculatum
Conium maculatum
Poison-hemlock
ID: 1335 3153 0669 0096 [detail]
J. E.(Jed) and Bonnie McClellan
© 2002 California Academy of Sciences

Conium maculatum
Conium maculatum
Poison Hemlock
ID: 8253 3202 0971 0111 [detail]
Charles Webber
© 1999 California Academy of Sciences

Conium maculatum
Conium maculatum
Poison Hemlock
ID: 5207 1611 1136 0071 [detail]
© 1995 Saint Mary's College of California

Conium maculatum
Conium maculatum
Poison Hemlock
ID: 5207 1611 1136 0073 [detail]
© 1995 Saint Mary's College of California

Conium maculatum
Conium maculatum
Poison Hemlock
ID: 8253 3202 4137 0009 [detail]
Beatrice F. Howitt
© 1999 California Academy of Sciences

Conium maculatum
Conium maculatum
Poison Hemlock
ID: 8253 3202 4138 0007 [detail]
J. E.(Jed) and Bonnie McClellan
© 1999 California Academy of Sciences

Conium maculatum
Conium maculatum
Poison Hemlock
ID: 8120 3181 4954 0085 [detail]
Charles Webber
© 1998 California Academy of Sciences

Conium maculatum
Conium maculatum
Poison Hemlock
ID: 5207 1611 1136 0072 [detail]
© 1995 Saint Mary's College of California

Conium maculatum
Conium maculatum
Poison Hemlock
ID: 8120 3181 4904 0115 [detail]
Charles Webber
© 1998 California Academy of Sciences

Conium maculatum
Conium maculatum
Poison Hemlock
ID: 9092 3191 3543 0001 [detail]
Gerald and Buff Corsi
© 1999 California Academy of Sciences

Conium maculatum
Conium maculatum
Poison Hemlock
ID: 0175 3301 2283 0012 [detail]
© 2001 CDFA

Conium maculatum
Conium maculatum
Poison Hemlock
ID: 1336 3162 1814 0014 [detail]
Jo-Ann Ordano
© 2004 California Academy of Sciences

Conium maculatum
Conium maculatum
Common Poison-hemlock
ID: 0000 0000 0706 0058 [detail]
© 2006 Jennifer Naegele

Conium maculatum
Conium maculatum
Common Poison-hemlock
ID: 0000 0000 0706 0059 [detail]
© 2006 Jennifer Naegele

Conium maculatum
Conium maculatum
Common Poison-hemlock
ID: 0000 0000 0706 0060 [detail]
© 2006 Jennifer Naegele

Conium maculatum
Conium maculatum
Common Poison-hemlock
ID: 0000 0000 0706 0061 [detail]
© 2006 Jennifer Naegele

Conium maculatum
Conium maculatum
Common Poison-hemlock
ID: 0000 0000 0706 0062 [detail]
© 2006 Jennifer Naegele

Conium maculatum
Conium maculatum
Poison Hemlock
ID: 1342 3162 2233 0123 [detail]
Gerald and Buff Corsi
© 2007 California Academy of Sciences

Conium maculatum
Conium maculatum
Poison Hemlock
ID: 1342 3162 2708 0087 [detail]
J. E.(Jed) and Bonnie McClellan
© 2007 California Academy of Sciences

Conium maculatum
Conium maculatum
Poison Hemlock
ID: 0000 0000 0808 1912 [detail]
© 2008 John Dittes

Conium maculatum
Conium maculatum
Poison Hemlock
ID: 0000 0000 0808 1913 [detail]
© 2008 John Dittes

Conium maculatum
Conium maculatum
Poison Hemlock
ID: 0000 0000 0808 2014 [detail]
© 2008 John Dittes

Conium maculatum
Conium maculatum
Poison Hemlock
ID: 0000 0000 1208 0356 [detail]
© 2008 Keir Morse

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