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Amaranthus floridanus (S. Watson) Sauer
Florida amaranth

Amaranthus floridanus
Copyright by: Alan Franck

Family: Amaranthaceae

Group: Dicot

Substrate: Terrestrial

Habit: Herb

Perennation: Annual

Native Range: Endemic to peninsular Florida.

Map of select IRC data for peninsular Florida

Florida Natural Areas Inventory State Status: Rare

IRC SOUTH FLORIDA Status: Presumed Extirpated or Extinct in the Wild

SOUTH FLORIDA Occurrence: Presumed Extirpated

SOUTH FLORIDA Native Status: Native

South Florida History and Distribution: A Florida endemic, this has only been collected a few times in Florida from Key West to Duval County, with the majority of collections along the Gulf Coast. It was reported in Rare Plants of South Florida (Gann et al. 2002, pp 113-115) as possibly extirpated in South Florida. Florida amaranth was thought to be possibly extinct in the wild throughout Florida until a single male plant was observed in 2024 by Alan Franck on Lido Key in Sarasota County, although subsequent searches at the site have been unsuccessful. This discovery, combined with the species’ annual life history, low detection probability by casual observers, and affinity for disturbed habitats suggest that viable seed banks may persist and that additional populations could remain undetected. The most recent collection was a germplasm collection made by the USDA in 1989 in Sarasota County. This is now in cultivation at Fairchild Tropical Botanic Garden from USDA germplasm.

SOUTH FLORIDA Cultivated Status: Not Cultivated

Comments: For an image of a type specimen collected on Key West by John Loomis Blodgett bewteen 1838 and 1853, visit the New York Botanical Garden Virtual Herbarium.

Other data on Amaranthus floridanus available from :

Amaranthus floridanus has been found in the following 2 conservation areas :
Occurrence Native Status
Cayo Costa State Park Presumed Extirpated Presumed Extirpated
Charlotte Harbor Preserve State Park Presumed Extirpated Presumed Extirpated

Amaranthus floridanus has been found in the following 2 counties :
Occurrence Native Status
Lee County Presumed Extirpated Presumed Extirpated
Monroe County (Keys) Presumed Extirpated Presumed Extirpated

Amaranthus floridanus has been found in the following 3 habitats :
Beach Dune
Coastal Strand
Disturbed Upland

All Images:

Amaranthus floridanus
Copyright by: Alan Franck
Amaranthus floridanus
Copyright by: Alan Franck
Amaranthus floridanus
Copyright by: Alan Franck
Amaranthus floridanus
Copyright by: Jimmy Lange
Amaranthus floridanus
Copyright by: Jimmy Lange
Amaranthus floridanus
Copyright by: Jimmy Lange