White Snakeroot Ageratina altissima (Linnaeus) King & H.E. Robinson var. altissima  Synonyms: Eupatorium ageratoides, Eupatorium rugosum.

Status:

All White Snakeroot in Maryland belong to the variety altissima except for a small population along the Potomac River in Montgomery County that belong to the variety roanensis.

There are 106 records in the project database.

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White Snakeroot blooming at Swan Creek, Anne Arundel Co., Maryland (10/5/2012). Photo by Bill Hubick. (MBP list)

White Snakeroot blooming along a wooded trail at Swan Creek, Anne Arundel Co., Maryland (10/7/2012). Photo by Bill Hubick. (MBP list)

White Snakeroot blooming along a wooded trail at Swan Creek, Anne Arundel Co., Maryland (10/7/2012). Photo by Bill Hubick. (MBP list)

White Snakeroot blooming along a wooded trail at Swan Creek, Anne Arundel Co., Maryland (10/7/2012). Photo by Bill Hubick. (MBP list)

White Snakeroot blooming at Swan Creek, Anne Arundel Co., Maryland (10/5/2012). Photo by Bill Hubick. (MBP list)

White Snakeroot in Kent Co., Maryland (9/26/2016). Photo by Dan Small. (MBP list)

The broad toothed leaves of White Snakeroot in Talbot Co., Maryland (9/20/2012). Photo by Jim Brighton. (MBP list)

White Snakeroot blooming in Washington Co., Maryland (9/9/2013). Photo by Jim Stasz. (MBP list)

White Snakeroot blooming in early winter in Harford Co., Maryland (12/6/2015). Photo by Bill Hubick. (MBP list)

White Snakeroot in Howard Co., Maryland (3/22/2019). Collected and processed by Helen Lowe Metzman. Photo by USGS PWRC. (MBP list)

White Snakeroot in Howard Co., Maryland (3/22/2019). Collected and processed by Helen Lowe Metzman. Photo by USGS PWRC. (MBP list)

White Snakeroot in Howard Co., Maryland (3/22/2019). Collected and processed by Helen Lowe Metzman. Photo by USGS PWRC. (MBP list)

White Snakeroot in Howard Co., Maryland (3/22/2019). Collected and processed by Helen Lowe Metzman. Photo by USGS PWRC. (MBP list)

White Snakeroot with Liriomyza eupatorii leaf mines in Harford Co., Maryland (7/1/2017). Photo by Bill Hubick. (MBP list)

White Snakeroot (seeds) in Howard Co., Maryland (10/3/1981). Photo by Robert Solem. (MBP list)


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