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Conyza canadensis (L.) Cronquist
Dwarf Canadian horseweed

Conyza canadensis
Copyright by: Shirley Denton

Family: Asteraceae

Group: Dicot

Substrate: Terrestrial

Habit: Herb

Perennation: Perennial

Native Range: North America, the West Indies, Mexico and Central America; now a weed throughout much of the world.

Map of select IRC data for peninsular Florida

IRC SOUTH FLORIDA Status: Secure

SOUTH FLORIDA Occurrence: Present

SOUTH FLORIDA Native Status: Native

SOUTH FLORIDA Cultivated Status: Not Cultivated

Comments: For more images, click on the Atlas of Vascular Plants link below.

Synonyms: C. canadensis var. pusilla.

Other data on Conyza canadensis available from :

Atlas of Florida Vascular Plants
Conyza canadensis has been found in the following 160 conservation areas :
Occurrence Native Status
A.D. Doug Barnes Park Present Native
Arch Creek Addition Present Native
Arch Creek Park Present Native
Attwood Addition, Indian Key Historic State Park Present Native
Babcock Ranch Preserve Present Native
Bahia Honda State Park Present Native
Big and Little George Hammocks Present Native
Big Cypress National Preserve Present Native
Bill Baggs Cape Florida State Park Present Native
Bill Sadowski Park Present Native
Biscayne National Park Present Native
Biscayne National Park, Florida Keys Section Present Native
Black Creek Forest Present Native
Black Point Park and Marina Present Native
Blazing Star Preserve Present Native
Blowing Rocks Preserve Present Native
Blue Heron Hammock, Florida Keys Wildlife and Environmental Area Present Native
Bonair Beach Parcel, Martin County Present Native
Boystown Pineland Present Native
Caloosahatchee Creeks Preserve Present Native
Camp Owaissa Bauer Addition Present Native
Castellow Hammock parcel 28 Present Native
Cayo Costa State Park Present Native
Cedar Point Environmental Park Present Native
Coconut Creek Maple Swamp Natural Area Present Native
Collier-Seminole State Park Present Native
Coral Pines Park Present Native
Coral Reef Park Present Native
Corkscrew Regional Ecosystem Watershed (CREW) Present Native
Corkscrew Swamp Sanctuary Present Native
County Line Scrub, Miami-Dade County Present Native
Crandon Park Present Native
Crocodile Lake National Wildlife Refuge Present Native
Crystal Lake Sand Pine Scrub Natural Area Present Native
Curry Hammock State Park Present Native
Dagny Johnson Key Largo Hammocks Botanical State Park Present Native
Danforth Park Present Native
Deering Estate at Cutler Present Native
Delray Oaks Natural Area Present Native
Dolphin Center and Dolphin Center Addition Present Native
Doris Davis Forman Wilderness Preserve Natural Area Present Native
Dove Creek Hammocks, Florida Keys Wildlife and Environmental Area Present Native
Dr. Von D. Mizell-Eula Johnson State Park Present Native
Dry Tortugas National Park Present Native
Dupuis Reserve Present Native
Eachus Pineland Present Native
Enchanted Forest Park Present Native
Everglades and Francis S. Taylor Wildlife Management Area Present Native
Everglades National Park Present Native
Fakahatchee Strand Preserve State Park Present Native
Florida Atlantic University Ecological Site Present Native
Florida City Pineland Assumed to be Present Native
Fort Lauderdale Ex. Airport Gopher Tortoise Preserve Present Native
Fred C. Babcock-Cecil M. Webb Wildlife Management Area Present Native
Frenchman's Forest Natural Area Present Native
Frog Pond/L-31 N Transition Lands Present Native
Fuchs Hammock Preserve Present Native
Gold Coast Railroad Museum Present Native
Gomez Present Native
Gopher Tortoise Preserve Present Native
Greynolds Park Present Native
Halpatiokee Regional Park Present Native
Harden Hammock Present Native
Hattie Bauer Hammock Present Native
Hawk's Hammock Park Present Native
High Ridge Scrub Natural Area Present Native
Highlands Scrub Natural Area Present Native
Hillsboro Pineland Natural Area Present Native
Hobe Sound National Wildlife Refuge Present Native
Hobe Sound Sandhill Present Native
Hugh Taylor Birch State Park Present Native
Ingram Pineland Present Native
Ives Estate Park Present Native
J.N. Ding Darling National Wildlife Refuge Present Native
J.W. Corbett Wildlife Management Area Present Native
John D. MacArthur Beach State Park Present Native
John Pennekamp Coral Reef State Park Assumed to be Present Native
Jonathan Dickinson State Park Present Native
Juno Dunes Natural Area Present Native
Jupiter Inlet Lighthouse Outstanding Natural Area Present Native
Jupiter Ridge Natural Area Present Native
Kendall Indian Hammocks Park Present Native
Key West National Wildlife Refuge Present Native
Kiplinger Present Native
Koreshan State Historic Site Present Native
Lake Okeechobee Marshes Present Native
Larry and Penny Thompson Park Present Native
Lignumvitae Key Botanical State Park Present Native
Lignumvitae Key Botanical State Park, Klopp Tract Present Native
Little Hamaca Park Present Native
Little Torch Hammocks, Florida Keys Wildlife and Environmental Area Present Native
Loggerhead Park Present Native
Long Key Natural Area & Nature Center Present Native
Lucille Hammock Present Native
Ludlam Pineland Present Native
Luis Martinez United States Army Reserve Station, Richmond Pine Rocklands Present Native
Matheson Hammock Park Present Native
Meissner Hammock Present Native
Military Trail Natural Area Present Native
Milton E. Thompson Park Present Native
Miramar Pineland Present Native
Mound Key Archaeological State Park Present Native
Muscara Present Native
National Key Deer Refuge Present Native
Navy Wells Pineland 39 Native
Navy Wells Pineland Preserve Present Native
Ned Glenn Nature Preserve Present Native
Nicodemus Slough Present Native
Nixon Smiley Pineland Addition Present Native
Nixon Smiley Pineland Preserve Present Native
Okaloacoochee Slough State Forest, Okaloacoochee Slough Wildlife Management Area Present Native
Okaloacoochee Slough Wildlife Management Area - FWC, Okaloacoochee Slough Wildlife Management Area Present Native
Oleta River State Park Present Native
Palm Drive Pineland Present Native
Pal-Mar Present Native
Peck Lake Park Present Native
Picayune Strand State Forest Present Native
Pine Ridge Sanctuary Present Native
Pine Shore Preserve Present Native
Pond Apple Slough Natural Area Present Native
Prairie Pines Preserve Present Native
Quail Roost Pineland Present Native
R. Hardy Matheson Preserve Present Native
Ramrod Hammocks, Florida Keys Wildlife and Environmental Area Present Native
Rock Pit 39 Present Native
Rockdale Pineland Present Native
Rocky Point Hammock Present Native
Ron Ehmann Park Present Native
Rookery Bay National Estuarine Research Reserve Present Native
Rosemary Scrub Natural Area Present Native
Royal Palm Beach Pines Natural Area Present Native
Savannas Preserve State Park Present Native
Scrub Oak Park Present Native
Seabranch Preserve State Park Present Native
Seacrest Scrub Natural Area Present Native
Secret Woods Nature Center Present Native
Seminole Wayside Park Present Native
Serenoa Glade Preserve Present Native
Sewell Park Present Native
Silver Palm Groves Present Native
Six Mile Cypress Slough Preserve Present Native
Snake Creek Hammocks, Florida Keys Wildlife and Environmental Area Present Native
SOCSOUTH Present Native
Spoonbill Sound Hammocks, Florida Keys Wildlife and Environmental Area Present Native
St. Lucie Inlet Preserve State Park Present Native
Stump Pass Beach State Park Present Native
Sunny Palms Pineland Present Native
Tall Cypress Natural Area Present Native
Tamiami Pineland Complex Addition Present Native
Tilton Present Native
Tree Island Park Present Native
Trinity Pineland Present Native
Tropical Park Present Native
West Biscayne Pineland Present Native
Wild Turkey Strand Preserve Present Native
Windley Key Fossil Reef Geological State Park Present Native
Woodmont Natural Area Present Native
Yamato Scrub Natural Area Present Native
Yellow Fever Creek Preserve Present Native
Zoo Miami Present Native

Conyza canadensis has been found in the following 11 counties :
Occurrence Native Status
Broward County Native
Charlotte County Native
Collier County Native
Glades County Native
Hendry County Native
Lee County Native
Martin County Native
Miami-Dade County Native
Monroe County (Keys) Native
Monroe County (Mainland) Native
Palm Beach County Native

Conyza canadensis has been found in the following 2 habitats :
Disturbed Upland
Pine Rockland

All Images:

Conyza canadensis
Copyright by: Shirley Denton
Conyza canadensis
Copyright by: James Johnson, 2014
In habitat, Miramar Pineland Natural Area,
Broward County, Florida