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You are here: Home / Plants / Species Profiles / Houndstongue
Species Profiles


HoundstongueScientific name: Cynoglossum officinale L. (ITIS)

Common names: Houndstongue, gypsy flower, rats and mice, dog bur

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Selected Resources

Native To: Eurasia (Kedzie-Webb and Sheley 2017)

Date of U.S. Introduction: First discovered in 1893 (Kedzie-Webb and Sheley 2017)

Means of Introduction: Introduced accidentally through contaminated seed (Kedzie-Webb and Sheley 2017)

Impact: Infests pasture and rangeland, where it is toxic to livestock (Kedzie-Webb and Sheley 2017)

Current U.S. Distribution:


Selected Resources:

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Council or Task Force

Fact Sheet: Hound's Tongue (Jan 2014; PDF | 700 KB)
Alberta Invasive Species Council (Canada).
See also: Fact Sheets for more information about individual invasive species, including those listed as "Prohibited Noxious" and "Noxious" under the Alberta Weed Control Act


Invasive Plant Atlas of the United States - Houndstongue
University of Georgia. Center for Invasive Species and Ecosystem Health.

Invasive Species Compendium - Cynoglossum officinale
CAB International.

Global Invasive Species Database - Cynoglossum officinale (herb)
IUCN. Species Survival Commission. Invasive Species Specialist Group.

Federal Government

U.S. National Plant Germplasm System - Cynoglossum officinale
USDA. ARS. National Genetic Resources Program. GRIN-Global.

Fire Effects Information System (FEIS) - Cynoglossum officinale
USDA. FS. Rocky Mountain Research Station. Fire Sciences Laboratory.

PLANTS Database - Gypsyflower
USDA. NRCS. National Plant Data Center.

State Government

Noxious Weed Species - Houndstongue
Colorado Department of Agriculture. Conservation Services Division. Noxious Weed Program.

"B" Rated Weeds - Houndstongue (PDF | 2.04 MB)
Oregon Department of Agriculture. Plant Division. Noxious Weed Control.
See also: Oregon Noxious Weed Profiles for more species

Class B Noxious Weed: Houndstongue
Washington State Noxious Weed Control Board.

King County (Washington) Noxious Weed Control Program - Houndstongue
King County Department of Natural Resources (Washington). Water and Land Resources Division.


Weed Control in Natural Areas in the Western United States: Houndstongue (2013; PDF | 278 KB)
University of California. Weed Research and Information Center.
See also: Weeds in Natural Areas for more information sheets

MontGuide - Houndstongue: Identification, Biology and Integrated Management (2017)
Montana State University Extension.

Houndstongue Identification and Control (Jun 2013)
North Dakota State University. Extension Service.

Range Plants of Utah - Houndstongue
Utah State University. Extension.


Noxious Weed Information - Houndstongue
Colorado Weed Management Association.

Weed Identification - Houndstongue
Montana Weed Control Association.


Integrated Taxonomic Information System. Cynoglossum officinale. [Accessed Sep 10, 2014].

Kedzie-Webb, S. and R.L. Sheley. 2017. Houndstongue: Identification, Biology and Integrated Management (PDF | 1.0 MB) Montana State University Extension. MontGuide MT199709AG.

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Last Modified: Sep 15, 2018
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