Conium maculatum - Banner
Image Information
Location: Searcy County, Arkansas
Month of Photograph: May
Distribution Map: Conium maculatum - Distribution Map Spacer
USDA, NRCS. 2012. The PLANTS Database (, 16 January 2012). National Plant Data Team, Greensboro, NC 27401-4901 USA. Spacer Guests can be assured that there is established evidence that this plant has been found in all of the green filled counties of Arkansas. However, the white filled counties should not be interpreted as counties in which this plant does not grow. They should instead be interpreted as counties which lack officially sanction evidence of the plants presence there.

Family: Apiaceae

Whole Plant

Conium maculatum - Whole Plant "
Not all images on this page were photographed on the same day or at the same location. The precise location and date that specific photographs were taken can be obtained by email.
Conium maculatum - Inflorescence Inflorescence
The fine article below was written by Dr. John Hilty and was found at the "Encylopedia of Life." (Original source = Illinois wildflowers)

"The ancient Athenians used the juices of this plant to execute their prisoners, including Socrates during 399 B.C. Death is caused by respiratory arrest and heart failure. Poison Hemlock is a tall and imposing plant that appears to be increasingly common. Many people walk past this species without even realizing what it is. Because there are many members of the Carrot family with small white flowers, it can be somewhat difficult to correctly identify this plant.

Conium maculatum - Flowers Close Flowers, close

Poison Hemlock has the following key features: 1) it is often tall-growing, 2) the foliage is at least double pinnate and fern-like in appearance, 3) the foliage has a bitter rank odor, especially when it is bruised, 4) the hairless stems have purple spots, 5) there are undivided bracts at the base of the compound umbel and undivided bractlets at the base of the umbellets, and 6) the small leaflets are pinnately cleft or dentate. Other members of the Carrot family lack one or more of these key features."

Hilty, John. “Conium maculatum.” Encyclopedia of Life, available from Accessed 29 February 2012.

Conium maculatum - Leaf (compound)Leaf, double or triple pinnately compound
A related look-alike plant is Angelica venenosa - hairy angelica.
 double or triple pinnately compound - Leaf Leaf, double or triple pinnately compound
Conium maculatum - Stem Stem
Whole Plant
Conium maculatum - Whole Plant