navigation
Previous Plant Next Plant

xxxHome
x
xAbsinth wormwood
x
xAlligatorweed
x
xAmerican Lotus
x
xAmerican Pondweed
x
xAmpelopsis
x
xAustralian Pine
x
xBaccharis
x
xBamboo
x
xBanana Passionflower
x
xBarnyard Grass
x
xBermuda Grass
x
xBirdsfoot Deervetch
x
xBlack Locust
x
xBlack Mustard
x
xBlue Lettuce
x
xBrazilian Elodea
x
xBrazilian Peppertree
x
xBufflegrass
x
xBull Thistle
x
xBulrush
x
xBurdock
x
xButtonbush
x
xCanada Thistle
x
xCattails
x
xCheatgrass
x
xCherry Silverberry
x
xChinaberry
x
xChineese Lespedeza
x
xChinese Bush Clover
x
xChinese Privete
x
xChinese Tallow Tree
x
xClimbing Hempweed
x
xCogon Grass
x
xCommon Buckthorn
x
xCommon Cocklebur
x
xCommon Reed
x
xCommon Sowthistle
x
xCoontail
x
xCottonwood
x
xCrownvetch
x
xCurlyleaf Pondweed
x
xDalmation Toadflax
x
xDiffuse Knapweed
x
xDuckweed
x
xDyer's Woad
x
xElephant Ears
x
xElodea
x
xEnglish Ivy
x
xEurasian Watermilfoil
x
xEuropean Stickseed
x
xField Bindweed
x
xField Mustard
x
xField Sowthistle
x
xFloating Heart
x
xFloating Primrose
x
xFlowering Rush
x
xFragrant Water-Lilly
x
xGallant Solder
x
xGarlic Mustard
x
xxGiant Foxtail
x
xGiant Reed
x
xGiant Salvinia
x
xGlossy Buckthorn
x
xGorse
x
xHalogeton
x
xHempnettle
x
xHimalayan Raspberry
x
xHoary Cress
x
xHorsenettle
x
xHorseweed
x
xHoundstongue
x
xHydrilla
x
xIvy Gourd
x
xJapanese Barberry
x
xJapanese knotweed
x
xJohnson Grass
x
xJointed Goatgrass
x
xKlamath Weed
x
xxKochia
x
xKoster's Curse
x
xKudzu
x
xLeafy Spurge
x
xLimnophila
x
xLongspine Sandbur
x
xMalaleuca
x
xMedusahead
x
xMiconia
x
xMimosa
x
xMiramar Weed
x
xMultiflora Rose
x
xMusk Thistle
x
xNepalese Brown Top
x
xNorway Maple
x
xOld World Climbing Fern
x
xOrange Hawkweed
x
xOxeye Daisy
x
xPale Yellow Iris
x
xPaper Mulberry
x
xPara Grass
x
xParrotfeather
x
xPerenial Pepperweed
x
xPeriwinkle
x
xPlumeless Thistle
x
xPoison Hemlock
x
xPorcelainberry
x
xPrincess Tree
x
xPuncturevine
x
xPurple Loosestrife
x
xPurple Starthistle
x
xPupletop Vervain
x
xQuackgrass
x
xQueen Anne's Lace
x
xRedroot Pigweed
x
xReed Canarygrass
x
xRice Cut-Grass
x
xRiviere Golden Bamboo
x
xRussian knapweed
x
xRussian Thistle
x
xSalvinia minima
x
xScotch Broom
x
xScotch Thistle
x
xSkeleton Weed
x
xSlender Naiad
x
xSmartwed
x
xSmooth Brome
x
xSouthern Naiad
x
xSpatter-Dock
x
xSpiny Naiad
x
xSpotted Knapweed
x
xStrawberry Guava
x
xSulfur cinquefoil
x
xSunflower
x
xSwallowworts
x
xTamarisk/Salt Cedar
x
xTansy Ragwort
x
xTeasel
x
xTexas Blueweed
x
xTorpedo Grass
x
xTree of Heaven
x
xTropical Soda Apple
x
xTumble Pigweed
x
xUruguayan Primrose
x
xVariable-Leaf Milfoil
x
xWater Buttercup
x
xWater Chestnut
x
xWater Moss
x
xWater Paspalum
x
xWater Shield
x
xWater Hyacinth
x
xWater Lettuce
x
xWater Willow
x
xWestern Water Hemlock
x
xWhite Sweetclover
x
xWhitetop
x
xWild Mustard
x
xWild Parsnip
x
xWillows
x
xYellow Nutsedge
x
xYellow Starthistle
x
xYellow Toadflax


Poison Hemlock - Conium maculatum
Family: Apiaceae

THIS PAGE IS UNDER CONSTRUCTION.

Description

Poison hemlock is a stout to slender biennial, up to 3 m tall, from an unbranched taproot. The stems are glabrous, glaucous and usually purple spotted. The leaves are broadly ovate in outline, 1-3 dm long, 3-4 times pinnately compound with sheathing petioles. The leaflets are ovate-oblong, 4-10 mm long, toothed or incised. The small white flowers are borne in compound umbels. Fruits are brown, broadly ovoid with prominent undulate ribs.

Interesting facts

Poison hemlock is very similar to the related species, water hemlock (Cicuta maculata). They can be distinguished by their roots and leaves. Poison hemlock has a long, unbranched, white, fleshy, taproot compared to the root system of water hemlock which is composed of several tubers. The leaf veins of poison hemlock run to the tips of the teeth while those of water hemlock run to the notches between the teeth. Poison hemlock can be found along roadsides, streambanks, ditches, canals, thickets, meadows, and low waste places.

All parts of the plant are poisonous. Symptoms include loss of appetite, excessive salivation, bloating, and a rapid but feeble pulse. Animals may also experience muscle incoordination and appear to have great abdominal pain. Many cases of human poisoning occur because the roots are mistaken for parsnips, the leaves for parsley, and the root and seeds for anise.

Links to more information


Website, video, and graphics by Rob Nelson
For more information on this plant or management please contact US Army Corp of Engineers

 

New Biology Video Podcast The Wild Classroom Biology Concepts Biodiversity Home