Great Ragweed Ambrosia trifida Linnaeus var. trifida  Synonyms: Giant Ragweed.

Status:

All the Great Ragweed in Maryland belongs to the variety trifida.

Relationships:

Host to Euaresta festiva larvae. Leaves are mined by the micro-moth Astrotischeria ambrosiaeella.

There are 185 records in the project database.

View species at Maryland Plant Atlas

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Great Ragweed in Dorchester Co., Maryland (9/13/2016). Photo by Wayne Longbottom. (MBP list)

The leaves of Great Ragweed in Dorchester Co., Maryland (6/25/2013). Photo by Jim Brighton. (MBP list)

Great Ragweed in Howard Co., Maryland (9/7/2017). Photo by Bill Hubick. (MBP list)

Great Ragweed blooming in Calvert Co., Maryland (8/29/2019). Photo by Tyler Bell. (MBP list)

Great Ragweed in Worcester Co., Maryland (8/19/2012). Photo by Bill Hubick. (MBP list)

The blooms of a Great Ragweed in Talbot Co., Maryland (9/1/2013). Photo by Jim Brighton. (MBP list)

Great Ragweed in Caroline Co., Maryland (9/13/2016). Photo by Wayne Longbottom. (MBP list)

Great Ragweed growing in Harford Co., Maryland (8/19/2017). Photo by Josh Emm. (MBP list)

Great Ragweed (flowers) in Howard Co., Maryland (9/3/2013). Photo by Joanne Solem. (MBP list)

Great Ragweed (close-up) in Anne Arundel Co., Maryland (8/28/2012). Photo by Bill Harms. (MBP list)

Great Ragweed in Howard Co., Maryland (9/3/2013). Photo by Joanne Solem. (MBP list)

Great Ragweed in Allegany Co., Maryland (7/21/2014). Photo by Kimberly Booth. (MBP list)

Great Ragweed in Allegany Co., Maryland (7/21/2014). Photo by Kimberly Booth. (MBP list)

Great Ragweed hosting a Calycomyza platyptera leaf mine in Worcester Co., Maryland (8/5/2018). Photo by Josh Emm. (MBP list)

Great Ragweed in Baltimore Co., Maryland (8/27/2016). Photo by Kirsten Johnson. (MBP list)

Great Ragweed in Anne Arundel Co., Maryland (8/28/2012). Photo by Bill Harms. (MBP list)


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