Richweed Collinsonia canadensis Linnaeus  Synonyms: Collinsonia scabriuscula, Collinsonia tuberosa, Northern Horse-balm.

Relationships:

Richweed is a host plant for the Horse Balm Gall Midge.

There are 136 records in the project database.

View species at Maryland Plant Atlas

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Richweed blooming in Howard Co., Maryland (8/30/2014). Photo by Bill Harms. (MBP list)

Richweed in Garrett Co., Maryland (6/20/2014). Photo by Jim Brighton. (MBP list)

Richweed blooming in Montgomery Co., Maryland (8/24/2015). Photo by Elizabeth Miller. (MBP list)

Richweed blooming in Allegany Co., Maryland (8/29/2014). Photo by Kimberly Booth. (MBP list)

Richweed blooms in Washington Co., Maryland (8/8/2009). Photo by Jim Brighton. (MBP list)

Richweed blooming in Harford Co., Maryland (8/24/2014). Photo by Joshua Jones. (MBP list)

Richweed in Howard Co., Maryland (8/20/2014). Photo by Joanne Solem. (MBP list)

Richweed blooming in Montgomery Co., Maryland (8/23/2015). Photo by Elizabeth Miller. (MBP list)

Richweed blooming in Howard Co., Maryland (8/12/2017). Photo by Bill Hubick. (MBP list)

Richweed blooming in Montgomery Co., Maryland (9/1/2017). Photo by Katherine Richards. (MBP list)

Richweed in Garrett Co., Maryland (7/12/2012). Photo by Jim Stasz. (MBP list)

Richweed in Allegany Co., Maryland (9/12/2016). Photo by Kimberly Booth. (MBP list)

Richweed with Horse Balm Gall Midge galls in Garrett Co., Maryland (7/26/2015). Photo by Boyer and McDowell. (MBP list)

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

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

Richweed in Garrett Co., Maryland (8/17/2019). Determined by Helen Lowe Metzman. Photo by Sue Muller. (MBP list)

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

Richweed in Caroline Co., Maryland (10/1/2018). Photo by Jim Brighton. (MBP list)


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