Spotted Knapweed in Caroline Co., Maryland (10/6/2012).

Photo by Jim Brighton MBP List

Spotted Knapweed in Frederick Co., Maryland (7/24/2016). Note ribbed bracts with black, triangular tips.

View Record Details Photo by Jane Hill MBP List

Spotted Knapweed, a very destructive invasive species, in Anne Arundel Co., Maryland (7/15/2012).

Photo by Bill Hubick MBP List

Spotted Knapweed blooming in Anne Arundel Co., Maryland (6/9/2019).

View Record Details Photo by Matthew Beziat MBP List

Spotted Knapweed leaves in Caroline Co., Maryland (10/6/2012).

View Record Details Photo by Jim Brighton MBP List

Spotted Knapweed in Anne Arundel Co., Maryland (7/27/2011).

View Record Details Photo by Bill Harms MBP List

Spotted Knapweed in Anne Arundel Co., Maryland (9/18/2010).

View Record Details Photo by Bill Harms MBP List

Spotted Knapweed in Howard Co., Maryland (8/12/2017).

View Record Details Photo by James Frost MBP List

Spotted Knapweed in Prince George's Co., Maryland (7/31/2020). (c) johnbotany, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 200994 - Psn: 55)

Spotted Knapweed in Prince George's Co., Maryland (7/31/2020). (c) johnbotany, some rights reserved (CC BY-NC).

View Record Details Photo by John Hall MBP List

Spotted Knapweed in Garrett Co., Maryland (7/12/2014).

View Record Details Photo by Bill Hubick MBP List

Spotted Knapweed in Garrett Co., Maryland (9/18/2021). (c) johnbotany, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 455732 - Psn: 200)

Spotted Knapweed in Garrett Co., Maryland (9/18/2021). (c) johnbotany, some rights reserved (CC BY-NC).

View Record Details Photo by John Hall MBP List

Spotted Knapweed in Allegany Co., Maryland (8/29/2025). (c) aaron graham, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1338578 - Psn: 200)

Spotted Knapweed in Allegany Co., Maryland (8/29/2025). (c) aaron graham, some rights reserved (CC BY-NC).

View Record Details Photo by aaron_graham via iNaturalist MBP List

Map Snapshot

200 Records

GA AL WA FR CL MO HO BA BC HA CE PG AA CV CH SM KE QA CN TA DO WI SO WO

Seasonality Summary

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Resources

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View at Maryland Plant Atlas Search Flora of North America Search Mid-Atlantic Herbaria Consortium Search Norton-Brown Herbarium Search MNPS Facebook posts

Citations

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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/. Use of media featured on Maryland Biodiversity Project is only permitted with express permission of the photographer.

Spotted Knapweed in Caroline Co., Maryland (10/6/2012). Media by Jim Brighton.

Spotted Knapweed in Frederick Co., Maryland (7/24/2016). Note ribbed bracts with black, triangular tips. View Record Details Media by Jane Hill.

Spotted Knapweed, a very destructive invasive species, in Anne Arundel Co., Maryland (7/15/2012). Media by Bill Hubick.

Spotted Knapweed blooming in Anne Arundel Co., Maryland (6/9/2019). View Record Details Media by Matthew Beziat.

Spotted Knapweed leaves in Caroline Co., Maryland (10/6/2012). View Record Details Media by Jim Brighton.

Spotted Knapweed in Anne Arundel Co., Maryland (7/27/2011). View Record Details Media by Bill Harms.

Spotted Knapweed in Anne Arundel Co., Maryland (9/18/2010). View Record Details Media by Bill Harms.

Spotted Knapweed in Howard Co., Maryland (8/12/2017). View Record Details Media by James Frost.

Spotted Knapweed in Prince George's Co., Maryland (7/31/2020). (c) johnbotany, some rights reserved (CC BY-NC). View Record Details Media by John Hall.

Spotted Knapweed in Garrett Co., Maryland (7/12/2014). View Record Details Media by Bill Hubick.

Spotted Knapweed in Garrett Co., Maryland (9/18/2021). (c) johnbotany, some rights reserved (CC BY-NC). View Record Details Media by John Hall.

Spotted Knapweed in Allegany Co., Maryland (8/29/2025). (c) aaron graham, some rights reserved (CC BY-NC). View Record Details Media by aaron_graham via iNaturalist.