Taxon  Report   2317 
Conium maculatum  L.
Poison hemlock
Conium maculatum
© 2011 Louis-M. Landry
Click on a photo to see it bigger.
Conium maculatum
© 2009 Neal Kramer
Conium maculatum, a dicot, is a perennial herb that is not native to California; it was introduced from elsewhere and naturalized in the wild.
It is an invasive plant. The California Invasive Plant Council classifies its potential impact on native ecosystems as moderate (plant profile / CalWeedMapper).

Interactive Distribution Map

Observation Hotline
(observation details + photos)

point, line, or polygon

one or more occurrences
within a 7.5-minute quadrangle

Plant Characteristics
and Associations

Bloom Period
Conium maculatum
© 2008 Keir Morse
Family: APIACEAE  
Genus: Conium
weed, characteristic of disturbed places, wetland-riparian
Habitat: disturbed, disturbed [Walker]
Wetlands:Equally likely to occur in wetlands or non wetlands [U.S. Fish & Wildlife Service.]
Toxicity: MAJOR   [California Poison Control System 2010]    
Name Status:
Accepted by TJM2 + PLANTS + JM93
More information about  Conium maculatum
Photos on CalPhotos / Google Images
Photos and ID tips from

Jepson eFlora

Records from the Consortium of California Herbaria

Original Publication citation (ITIS)


Search the International Plants Names Index

Search (Flora of North America)

website references from Google

Suggested Citation
Calflora: Information on California plants for education, research and conservation,
with data contributed by public and private institutions and individuals, including the Consortium of California Herbaria.
[web application]. 2016. Berkeley, California: The Calflora Database [a non-profit organization].
Available:   (Accessed: Oct 26, 2016).

The information on this page comes from diverse sources. None of the links are sponsored.