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Floristic Inventory of the Florida Keys Database Online

Symphyotrichum expansum (Poeppig ex Spreng.) G.L. Nesom
Southwestern annual saltmarsh aster

Symphyotrichum expansum
Copyright by: Roger L. Hammer, 2020. A weed growing in an abandoned road bed at Dagny Johnson Key Largo Hammock Botanical State Park, Monroe County, Florida, USA.

Family: Asteraceae

Group: Dicot

Substrate: Terrestrial

Habit: Herb

Perennation: Perennial

Native Range: Southern United States, the West Indies (Greater Antilles), Mexico; perhaps speading as a weed elsewhere.

Map of select IRC data for peninsular Florida

SOUTH FLORIDA Occurrence: Present

SOUTH FLORIDA Native Status: Assumed to be Native

South Florida History and Distribution: A weed similar to S. bahamense. Very likely more common than records indicate. Reported by J.K. Small (1913) for Key West.

Synonyms: Aster inconspicuus.

FLORIDA KEYS Occurrence: Present

FLORIDA KEYS Native Status: R

Map of select IRC data for the Florida Keys

Florida Keys History and Distribution: Reported in 1913 by John Kunkel Small for sandy places on Key West, where collected as a weed by David W. Hall (286 USF) in 1971. Also collected as a weed in 1981 on Big Pine Key by William C. Brumbach (9729 USF),and photographed on North Key Largo by Roger Hammer in 2020. Almost certainly more common and overlooked.

Other data on Symphyotrichum expansum available from :


Symphyotrichum expansum has been reported from the following conservation area in the FLORIDA KEYS :
Occurrence Native Status
Dagny Johnson Key Largo Hammocks Botanical State Park Present Native






All Images:

Symphyotrichum expansum
Copyright by: Roger L. Hammer, 2020. A weed growing in an abandoned road bed at Dagny Johnson Key Largo Hammock Botanical State Park, Monroe County, Florida, USA.