Conium maculatum

ClassificationDicots
FamilyApiaceae
Family (Traditional)Apiaceae
GenusConium
Species:Conium maculatum L.
Common NamePoison Hemlock
Growth Habitforb
Plant Notes**
CharacteristicsArmaments: No; Milky Sap: No; Photosynthetic: Yes; Stipules: No; Woody Herbaceous: Herbaceous; Duration: Biennial; General Ecology: Terrestrial; Growth Habit: forb; Moisture Requirements: Dry-mesic; Moisture Requirements: Mesic; Region of Origin: Asia; Region of Origin: Europe; Reproductive Phenology: May; Reproductive Phenology: June; Reproductive Phenology: July; Leaf Arrangement: alternate; Leaf Complexity: compound; Leaf Dissection: 2.5; Leaf Persistance: Deciduous; Leaf Petiole Type: petiolate; Leaf Type: broadleaf; Leaf Venation: pinnate; Leaflet Margins: entire; Leaflet Margins: lobed; Leaflet Number: 20+; Base Flower Color: White; Carpel Number/Pistil: 2; Fruit Dehiscence: No; Fruit Type: Schizocarp; Fruit Wet/Dry: Dry; Hypanthium Present: No; Inflorescence Position: terminal; Inflorescence Types: corymb/cyme/umbel; Ovary Position: Inferior; Overall Flower Symmetry: Actinomorphic; Ovules per Carpel: 2; Perianth Present: Yes; Petal Fusion: No; Petal Number: 5; Pistil Complexity: Compound; Pistil Number: 1; Placentation Type: Axillary; Sepal Fusion: No; Sepal Number: 0; Sepal Number: 5; Sexuality: monoclinous; Sporangium Arrangement: N/A; Stamen Number: 5; Tepal Fusion: N/A; Tepal Number: N/A
C value N/A
StatusNot Native; AGCP (FACW), EMP (FACW) (NWPL); TN[SNA] KY[SNA] (State Rank); G5 (Global Rank)
Specimen(s) View and Download Specimen Details »

** Not applicable or data not available.

Species Distribution Map

This species has been reported in the counties highlighted in the interactive distribution map below. Click on a county to display the its name. Click the question mark icon () to view additional information about the ecoregions shown. In the map legend, there are links to toggle the visibility of the ecoregions and/or their labels. In addition, clicking on an ecoregion name will highlight that region on the map.

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  • State Boundaries
  • Counties
  • Counties - Species Present
Ecoregions
  • Southeastern Plains
    • Blackland Prarie
  • Blue Ridge Mountains
  • Ridge and Valley
  • Cumberland Plateau
  • Cumberland Mountains
  • Allegheny Plateau
  • Interior Plateau
    • Bluegrass Region
    • Nashville Basin
    • Pennyroyal Karst Plain
    • Western Highland Rim
    • Eastern Highland Rim

Synonyms (1)

SynonymFull Citation
Conium divaricatum Conium divaricatum

Specimens and Distribution

This species has been reported in the following counties by the herbaria listed. An overview of the individual specimens are provided in the table that follows. Click on the accession number to view details; click on column headers to sort.

Counties included on distribution map: Anderson (KY), Barren (KY), Bath (KY), Clark (KY), Clinton (KY), Estill (KY), Fayette (KY), Franklin (KY), Garrard (KY), Harlan (KY), Hart (KY), Jefferson (KY), Jessamine (KY), Lewis (KY), Madison (KY), Magoffin (KY), Marion (KY), Martin (KY), Menifee (KY), Mercer (KY), Metcalfe (KY), Montgomery (KY), Nicholas (KY), Oldham (KY), Powell (KY), Robertson (KY), Rockcastle (KY), Taylor (KY), Warren (KY), Woodford (KY), Bedford (TN), Cannon (TN), Carroll (TN), Carter (TN), Cheatham (TN), Cocke (TN), Davidson (TN), DeKalb (TN), Dickson (TN), Franklin (TN), Giles (TN), Hancock (TN), Humphreys (TN), Knox (TN), Maury (TN), Montgomery (TN), Moore (TN), Morgan (TN), Putnam (TN), Robertson (TN), Rutherford (TN), Sequatchie (TN), Stewart (TN), Sumner (TN), Unicoi (TN), Washington (TN), Williamson (TN)

Herbaria represented by specimen data listed below: APSC, BEREA, BOON, EKY, ETSU, HTTU, MTSU, TENN, UCHT, UOS, VDB

Range of years during which specimens were collected: 1956 - 2014

Accession No. (click for full details)
County
State
Coll. Date
Collector &
Collection No.
Herbarium &
Herbarium Name Used
31234100200326 Anderson Kentucky 01 Jun 1956 Mary E. Wharton
9976
EKY
Conium maculatum
31234100200334 Anderson Kentucky 08 Jun 1963 Elizabeth M. Browne
7130
EKY
Conium maculatum
31234100200342 Anderson Kentucky 14 Jun 1978 William S. Bryant
542
EKY
Conium maculatum
TENN-V-0161008 Anderson Kentucky
TENN
Conium maculatum
APSC0057769 Barren Kentucky 13 Jun 1979 G.P. Johnson
APSC
Conium maculatum
BEREA024076 Bath Kentucky
BEREA
Conium maculatum
TENN-V-0160977 Bedford Tennessee
TENN
Conium maculatum
BRIT72561 Cannon Tennessee
VDB
Conium maculatum
TENN-V-0160978 Cannon Tennessee
TENN
Conium maculatum
010872 Carroll Tennessee 09 Jul 1972 Betty Toler Allman
655
BOON
Conium maculatum
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Plant Photos

Conium maculatum - Dwayne Estes
Conium maculatum - Dwayne Estes
Conium maculatum - Dwayne Estes
Conium maculatum - Dwayne Estes
Conium maculatum - Dwayne Estes
Conium maculatum - Dwayne Estes