Poison Hemlock Conium maculatum LinnaeusNon-native  -  Invasive    Synonyms: Poison-hemlock.
Kingdom Plantae   >   Division Tracheophyta   >   Class Magnoliopsida   >   Order Apiales   >   Family Apiaceae   >   Genus Conium   

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Poison Hemlock blooming in Anne Arundel Co., Maryland (6/7/2017). Photo by Bill Hubick. (MBP list)

Poison Hemlock blooming in Howard Co., Maryland (6/6/2015). Photo by Bill Harms. (MBP list)

Poison Hemlock in Howard Co., Maryland (6/6/2015). Photo by Bill Harms. (MBP list)

Poison Hemlock in Howard Co., Maryland (6/24/2010). Photo by Bill Harms. (MBP list)

Poison Hemlock in Howard Co., Maryland (6/6/2015). Photo by Bill Harms. (MBP list)

Poison Hemlock in Talbot Co., Maryland (5/16/2015). Photo by Jim Brighton. (MBP list)

The leaf structure of Poison Hemlock in Baltimore Co., Maryland (7/8/2017). Photo by Emily Stanley. (MBP list)

Poison Hemlock in Howard Co., Maryland (7/24/2019). Determined by Helen Lowe Metzman. Photo by Sue Muller. (MBP list)

Poison Hemlock in Maryland (7/3/2020). (c) johnbotany, some rights reserved (CC BY-NC). Photo by John Hall. (MBP list)

Poison Hemlock blooming in Harford Co., Maryland (5/30/2018). Photo by Josh Emm. (MBP list)

Poison Hemlock in Allegany Co., Maryland (6/7/2016). Photo by Kimberly Booth. (MBP list)

Poison Hemlock emerging in early winter in Montgomery Co., Maryland (2/18/2018). Photo by Bill Hubick. (MBP list)

Poison Hemlock in Frederick Co., Maryland (7/7/2019). Photo by Bill Hubick. (MBP list)

Poison Hemlock in Kent Co., Maryland (6/3/2016). Photo by Dan Small. (MBP list)

Poison Hemlock in Washington Co., Maryland (5/28/2017). Photo by Bill Harms. (MBP list)


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MBP marks as "Invasive" any taxon listed in the Maryland Invasive Species Council (MISC) list of Invasive Species of Concern in Maryland. You can read their criteria and review the lists here: https://mdinvasives.org/species-of-concern/.

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