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Conyza canadensis (L.) Cronquist
Canadian horseweed

       
Symbol:    
Group:    
Family:    
Duration:    
Growth Habit:    
Native Status:  
  
  
  
  
  
  
  



Click on the image below to enlarge it and download a high-resolution JPEG file.
Photo of Conyza canadensis (L.) Cronquist
Robert H. Mohlenbrock. USDA SCS. 1991. Southern wetland flora: Field office guide to plant species. South National Technical Center, Fort Worth. Courtesy of USDA NRCS Wetland Science Institute. Usage Requirements.
 
More Information:
 

Images:
Conyza canadensis (L.) Cronquist

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Distribution:
Conyza canadensis (L.) Cronquist

View Native Status
Distribution Map Legend

See U.S. county distributions (when available) by clicking on the map or the linked states below:

USA (AK, AL, AR, AZ, CA, CO, CT, DC, DE, FL, GA, HI, IA, ID, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NH, NJ, NM, NV, NY, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VA, VT, WA, WI, WV, WY), USA+ (PR, VI), CAN (AB, BC, MB, NB, NF, NS, NT, ON, PE, QC, SK), FRA (SPM)
 

Related Taxa:
Conyza canadensis (L.) Cronquist

View 477 genera in Asteraceae, 6 species in Conyza or click below on a thumbnail map or name for species profiles.
Distribution of Conyza canadensis (L.) Cronquist var. canadensis. . Image Available.
Conyza canadensis var. canadensis
Canadian horseweed
Distribution of Conyza canadensis (L.) Cronquist var. glabrata (A. Gray) Cronquist. .
Conyza canadensis var. glabrata
Canadian horseweed
Distribution of Conyza canadensis (L.) Cronquist var. pusilla (Nutt.) Cronquist. .
Conyza canadensis var. pusilla
Canadian horseweed
Plant is native (blue) Native   Plant is introduced Introduced
Related taxa legend
 

Classification:
Conyza canadensis (L.) Cronquist

Click on a scientific name below to expand it in the PLANTS Classification Report.
   
Kingdom Plantae – Plants
Subkingdom Tracheobionta – Vascular plants
Superdivision Spermatophyta – Seed plants
Division Magnoliophyta – Flowering plants
Class Magnoliopsida – Dicotyledons
Subclass Asteridae
Order Asterales
Family Asteraceae – Aster family
Genus Conyza Less. – horseweed
Species Conyza canadensis (L.) Cronquist – Canadian horseweed
 

Threatened and Endangered Information:
Conyza canadensis (L.) Cronquist

The related entity italicized and indented below is listed by the U.S. federal government or a state. Common names are from state and federal lists. Click on a place name to get a complete protected plant list for that location.

Indiana:
Conyza canadensis var. pusilla
fleabane              Extirpated
 

U.S. Weed Information:
Conyza canadensis (L.) Cronquist

horseweed
horseweed fleabane
mares tail

This plant can be weedy or invasive according to the authoritative sources noted below. This plant may be known by one or more common names in different places, and some are listed above. Click on an acronym to view each weed list, or click here for a composite list of Weeds of the U.S.

KY        Haragan, P.D. 1991. Weeds of Kentucky and adjacent states: a field guide. The University Press of Kentucky. Lexington, Kentucky. 278pp.
N'EAST        Uva, R.H., J.C. Neal, & J.M. DiTomaso. 1997. Weeds of the Northeast. Cornell University Press. Ithaca, New York. 397pp.
NE&GP        Stubbendieck, J., G.Y. Friisoe, & M.R. Bolick. 1994. Weeds of Nebraska and the Great Plains. Nebraska Department of Agriculture, Bureau of Plant Industry. Lincoln, Nebraska. 589pp.
SWSS        Southern Weed Science Society. 1998. Weeds of the United States and Canada. CD-ROM. Southern Weed Science Society. Champaign, Illinois.
WSWS        Whitson, T.D. (ed.) et al. 1996. Weeds of the West. Western Society of Weed Science in cooperation with Cooperative Extension Services, University of Wyoming. Laramie, Wyoming. 630pp.
 

Introduced Information:
Conyza canadensis (L.) Cronquist

This plant is introduced to the United States from another country or countries. Click on link below for a partial or complete list of U.S. introduced plants.

Scientific Name= A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | all
Common Name= A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | all
 

Wetland Indicator Status:
Conyza canadensis (L.) Cronquist

Nat. Ind. Reg. 1 Reg. 2 Reg. 3 Reg. 4 Reg. 5 Reg. 6 Reg. 7 Reg. 8 Reg. 9 Reg. 0 Reg. A Reg. C Reg. H
UPL,FAC UPL FACU FAC- FACU FACU- UPL FACU UPL FACU FAC NO FACU UPL
Interpreting Wetland Indicator Status
 

Wildlife Habitat Values:
Conyza canadensis (L.) Cronquist

  Large Mammals Small Mammals Water Birds Terrestrial Birds
Source Large Mammals Food Large Mammals Cover Small Mammals Food Small Mammals Cover Water Birds Food Water Birds Cover Terrestrial Birds Food Terrestrial Birds Cover
Gee Moderate              
Miller Minor              
Wildlife Habitat Values

 

Gee, K.L., M.D. Porter, S. Demarais, F.C. Bryant, and G.V. Vreede. 1994. White-tailed deer: Their foods and management in the Cross Timbers. Ardmore.

Miller, J.H., and K.V. Miller. 1999. Forest plants of the southeast and their wildlife uses. Southern Weed Science Society.

 

More Accounts and Images:
Conyza canadensis (L.) Cronquist

View photographs from CalPhotos.

View species account, photographs, and distribution from USF Atlas of Florida Vascular Plants.

View species account from ARS Germplasm Resources Information Network (GRIN).

View taxonomic account from Integrated Taxonomic Information System (ITIS) for ITIS Taxonomic Serial Number 37113.

View species account and distribution map from Jepson Interchange (University of California - Berkeley).

View species account and photographs from Lady Bird Johnson Wildflower Center Native Plant Information Network (NPIN).

View species account from Native American Ethnobotany (University of Michigan - Dearborn).

View photographs and distribution from University of Tennessee Herbarium.

View species account, photographs, and distribution from University of Washington Burke Museum.

 

Related Web Sites:
Conyza canadensis (L.) Cronquist

Arizona: abstract & image of horseweed (Conyza canadensis)

Purdue University, Botany Department: no-till abstract & images

UC Davis, IPM: abstract & images

Virginia: abstract & image

Weed Science Society of America

 
 
Time Generated: 09/24/2008 08:40 AM MDT