Conium maculatum

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Scientific Name Conium maculatum USDA PLANTS Symbol COMA2
Common Name Poison Hemlock ITIS Taxonomic Serial No. 29473
Family Apiaceae (Parsley) SEINet
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Description Life zones and habitat: Plains and foothills (3600 to 8700 ft.); moist soils in roadside ditches and disturbed areas.
Plant: Tall, erect, branching, biennial 2 to 10 ft. tall; hollow, purple-spotted stems; herbaceous rosette in the first season, upright floral stems in the second season. Plant has a disagreeable odor and all parts are very poisonous.
Leaves: Compound basal and stem leaves finely pinnately or ternate-pinnately-dissected with a fern-like appearance, 6 to 12 inches long overall.
Inflorescence: Loose inflorescence of umbels 1 to 3 inches in diameter; small white flowers with 5 petals and an enlarged style base.
Bloom Period: June to August.
References: "Flora of Colorado" by Jennifer Ackerfield, SEINet and UW Burke Herbarium.
BONAP Distribution Map

Colorado Status:
Noxious Weed

© Tom Lebsack 2021