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Youngia japonica (L.) DC.
Rocketweed, Oriental false hawksbeard

Youngia japonica
Copyright by: Keith A. Bradley

Family: Asteraceae

Group: Dicot

Substrate: Terrestrial

Habit: Herb

Perennation: Short Lived Perennial

Native Range: Southeastern Asia; now a widespread weed.

Map of select IRC data for peninsular Florida

SOUTH FLORIDA Occurrence: Present

SOUTH FLORIDA Native Status: Not Native, Naturalized

South Florida History and Distribution: IRC considers this an emerging invasive in South Florida.

SOUTH FLORIDA Cultivated Status: Not Cultivated

Other data on Youngia japonica available from :

Atlas of Florida Vascular Plants
Youngia japonica has been found in the following 86 conservation areas :
Occurrence Native Status
A.D. Doug Barnes Park Present Not Native, Naturalized
Alice C. Wainwright Park Present Not Native, Naturalized
Arch Creek Addition Present Not Native, Naturalized
Arch Creek Park Present Not Native, Naturalized
Big and Little George Hammocks Present Not Native, Naturalized
Big and Little George Hammocks Present Not Native, Naturalized
Big Cypress National Preserve Present Not Native, Naturalized
Bill Baggs Cape Florida State Park Present Not Native, Naturalized
Bill Sadowski Park Present Not Native, Naturalized
Biscayne National Park Present Not Native, Naturalized
Biscayne National Park, Florida Keys Section Present Not Native, Naturalized
Black Creek Forest Present Not Native, Naturalized
Boystown Pineland Present Not Native, Naturalized
Caloosahatchee Creeks Preserve Present Not Native, Naturalized
Caloosahatchee Regional Park Present Not Native, Naturalized
Camp Owaissa Bauer Present Not Native, Naturalized
Castellow Hammock parcel 28 Present Not Native, Naturalized
Castellow Hammock parcel 31 Present Not Native, Naturalized
Castellow Hammock Park Present Not Native, Naturalized
Chapman Field Park Present Not Native, Naturalized
Chernoff Hammock Present Not Native, Naturalized
Coconut Creek Maple Swamp Natural Area Present Not Native, Naturalized
Coral Pines Park Present Not Native, Naturalized
Crocodile Lake National Wildlife Refuge Present Not Native, Naturalized
Dagny Johnson Key Largo Hammocks Botanical State Park Reported
Deering Estate at Cutler Present Not Native, Naturalized
Delray Oaks Natural Area Present Not Native, Naturalized
Doris Davis Forman Wilderness Preserve Natural Area Present Not Native, Naturalized
Dr. Von D. Mizell-Eula Johnson State Park Present Not Native, Naturalized
Dupuis Reserve Present Not Native, Naturalized
Eachus Pineland Present Not Native, Naturalized
Enchanted Forest Park Present Not Native, Naturalized
Everglades and Francis S. Taylor Wildlife Management Area Present Not Native, Naturalized
Everglades National Park Present Not Native, Naturalized
Fisheating Creek Wildlife Management Area Present Not Native, Naturalized
Frenchman's Forest Natural Area Present Not Native, Naturalized
Fuchs Hammock Preserve Present Not Native, Naturalized
Greynolds Park Present Not Native, Naturalized
Gulfstream Park Present Not Native, Naturalized
Harden Hammock Present Not Native, Naturalized
Hattie Bauer Hammock Present Not Native, Naturalized
Hillsboro Pineland Natural Area Present Not Native, Naturalized
Hobe Sound National Wildlife Refuge Present Not Native, Naturalized
Holiday Hammock Present Not Native, Naturalized
Hugh Taylor Birch State Park Present Not Native, Naturalized
Ingram Pineland Present Not Native, Naturalized
J.N. Ding Darling National Wildlife Refuge Present Not Native, Naturalized
John D. MacArthur Beach State Park Present Not Native, Naturalized
John Pennekamp Coral Reef State Park Present Not Native, Naturalized
Jonathan Dickinson State Park Present Not Native, Naturalized
Juno Dunes Natural Area Present Not Native, Naturalized
Kendall Indian Hammocks Park Present Not Native, Naturalized
Kendalwood Present Not Native, Naturalized
Lake Okeechobee Marshes Present Not Native, Naturalized
Larry and Penny Thompson Park Present Not Native, Naturalized
Long Key Natural Area & Nature Center Present Not Native, Naturalized
Loxahatchee Slough Natural Area Present Not Native, Naturalized
Lucille Hammock Present Not Native, Naturalized
Matheson Hammock Park Present Not Native, Naturalized
National Key Deer Refuge Possibly Extirpated Not Native, Naturalized
Navy Wells Pineland Preserve Present Not Native, Naturalized
Ocean Ridge Hammock Park Present Not Native, Naturalized
Palm Drive Pineland Present Not Native, Naturalized
Peck Lake Park Present Not Native, Naturalized
Phipps Ocean Park Present Not Native, Naturalized
Pine Shore Preserve Present Not Native, Naturalized
Porter-Russell Pineland Present Not Native, Naturalized
R. Hardy Matheson Preserve Present Not Native, Naturalized
Red Reef Park, including Gumbo Limbo Nature Center Present Not Native, Naturalized
Riverbend Park Present Not Native, Naturalized
Rock Pit 39 Present Not Native, Naturalized
Rolling Oaks Park Present Not Native, Naturalized
Seabranch Preserve State Park Present Not Native, Naturalized
Secret Woods Nature Center Present Not Native, Naturalized
Seminole Wayside Park Present Not Native, Naturalized
Sewell Park Present Not Native, Naturalized
Silver Palm Groves Present Not Native, Naturalized
Silver Palm Hammock Present Not Native, Naturalized
Six Mile Cypress Slough Preserve Present Not Native, Naturalized
Tall Cypress Natural Area Present Not Native, Naturalized
The Barnacle State Historic Park Present Not Native, Naturalized
Trail Glades Range Present Not Native, Naturalized
Tree Island Park Present Not Native, Naturalized
Vizcaya Museum and Gardens Present Not Native, Naturalized
Warbler Wetland Natural Area Present Not Native, Naturalized
West Biscayne Pineland Present Not Native, Naturalized

Youngia japonica has been found in the following 7 counties :
Occurrence Native Status
Broward County Not Native, Naturalized
Hendry County
Lee County Not Native, Naturalized
Martin County Not Native, Naturalized
Miami-Dade County Not Native, Naturalized
Monroe County (Keys) Not Native, Naturalized
Palm Beach County Not Native, Naturalized

Youngia japonica has been found in the following 10 habitats :
Alluvial Forest
Disturbed Upland
Disturbed Wetland
Dome Swamp
Floodplain Swamp
Mesic Hammock
Pine Rockland
Prairie Hammock
Rockland Hammock
Strand Swamp

All Images:

Youngia japonica
Copyright by: Keith A. Bradley
Youngia japonica
Copyright by: Roger L. Hammer