OF THE CAROLINAS & GEORGIA

Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Apiales

WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Conium maculatum   FAMILY Apiaceae   Go to FSUS key



SYNONYMOUS WITH PLANTS NATIONAL DATABASE:
Conium maculatum   FAMILY Apiaceae

SYNONYMOUS WITH Floristic Synthesis of North America. BONAP (Kartesz, 2021)

Conium maculatum

SYNONYMOUS WITH VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 140-24-001:

Conium maculatum   FAMILY Apiaceae

SYNONYMOUS WITH Manual of the Southeastern Flora (Small, 1933, 1938)

Conium maculatum

 

COMMON NAME:
Poison-hemlock


         To see larger pictures, click or hover over the thumbnails.

image of Conium maculatum, Poison-hemlock

USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913    pnd_coma2_001_lvd

        

image of Conium maculatum, Poison-hemlock

USDA / Selected Weeds of the US. 1970    swus_page_281

        

image of Conium maculatum, Poison-hemlock

JK Marlow    jkm090405_092

April    Walker County    GA

image of Conium maculatum, Poison-hemlock

JK Marlow    jkm090405_094b

April    Walker County    GA

Stems hollow, spotted, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).

image of Conium maculatum, Poison-hemlock

JK Marlow    jkm090524_012

May    Pickens County    SC

Roadside ditch

Leaves broadly triangular, 3-4x pinnately compound, can be over 12" long, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).

image of Conium maculatum, Poison-hemlock

JK Marlow    jkm090524_014

May    Pickens County    SC

Roadside ditch

image of Conium maculatum, Poison-hemlock

JK Marlow    jkm090524_017

May    Pickens County    SC

Roadside ditch

image of Conium maculatum, Poison-hemlock

JK Marlow    jkm090524_037

May    Pickens County    SC

Roadside ditch

A coarse, taprooted biennial to 9' tall, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).

image of Conium maculatum, Poison-hemlock

JK Marlow    jkm090524_042

May    Pickens County    SC

Roadside ditch

image of Conium maculatum, Poison-hemlock

JK Marlow    jkm090524_057

May    Pickens County    SC

Roadside ditch

image of Conium maculatum, Poison-hemlock

JK Marlow    jkm090524_059

May    Pickens County    SC

Roadside ditch

image of Conium maculatum, Poison-hemlock

JK Marlow    jkm090524_063

May    Pickens County    SC

Roadside ditch

Tiny white flowers in umbels 1.5-2.5" wide, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).

image of Conium maculatum, Poison-hemlock

Richard and Teresa Ware    rtw_conium_maculatum_19

May        

image of Conium maculatum, Poison-hemlock

Ron Lance    rwl_conium_maculatum

June    Jackson County    NC

Big Ridge Preserve

image of Conium maculatum, Poison-hemlock

Steve Dewey, Utah State University, Bugwood.org    bug_1459207

Month Unknown        

image of Conium maculatum, Poison-hemlock

Joseph M. DiTomaso, University of California - Davis, Bugwood.org    bug_5374190

Month Unknown        

image of Conium maculatum, Poison-hemlock

Joseph M. DiTomaso, University of California - Davis, Bugwood.org    bug_5374191

Month Unknown        

image of Conium maculatum, Poison-hemlock

John M. Randall, The Nature Conservancy, Bugwood.org     bug_5392073

Month Unknown        

image of Conium maculatum, Poison-hemlock

Bruce Ackley, The Ohio State University, Bugwood.org    bug_5438055

Month Unknown        

image of Conium maculatum, Poison-hemlock

D. Walters and C. Southwick, Table Grape Weed Disseminule ID, USDA APHIS ITP, B    bug_5458174

Month Unknown        

 

 

WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Conium maculatum   FAMILY Apiaceae

SYNONYMOUS WITH PLANTS NATIONAL DATABASE:
Conium maculatum   FAMILY Apiaceae

SYNONYMOUS WITH Floristic Synthesis of North America. BONAP (Kartesz, 2021)
Conium maculatum

SYNONYMOUS WITH VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 140-24-001:
Conium maculatum   FAMILY Apiaceae

SYNONYMOUS WITH Manual of the Southeastern Flora (Small, 1933, 1938)
Conium maculatum

 

Find by SCIENTIFIC NAME:

2837

Forb
Biennial

Habitat: Ditches, roadsides, streambanks, disturbed areas, per Weakley's Flora

Non-native: Eurasia

Uncommon (rare in SC Coastal Plain) (rare in GA)

map
CLICK HERE to see a map, notes, and images from Weakley's Flora of the Southeastern US.

Click here to see a map showing all occurrences known to SERNEC, a consortium of southeastern herbaria. (Zoom in to see more detail.)


Invasive?

This plant may be causing problems in natural areas outside its native range, according to authorities such as:

 

LEAVES:
Complexly compound, with 2+ levels of pinnate and/or ternate compoundness
Alternate

FLOWER:
Spring/Summer
White
Radially symmetrical
5-merous
Inferior ovary

Flowers in compound umbels

FRUIT:
Summer
Schizocarp of two mericarps

 

TO LEARN MORE about this plant, look it up in a good book!



 


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