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Plant Database

Search for native plants by scientific name, common name or family. If you are not sure what you are looking for, try the Combination Search or our Recommended Species lists.

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Amaranthus australis

Amaranthus australis (A. Gray) Sauer

Southern Amaranth, Southern Pigweed, Southern Water-hemp

Amaranthaceae (Amaranth family)

Synonym(s): Acnida alabamensis, Acnida australis, Acnida cuspidata


USDA Native Status: L48 (N), PR (N)


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Plant Characteristics

Duration: Annual
Habit: Herb , Subshrub
Size Notes: Up to about 10 feet tall. Occasionally much taller.
Fruit: Utricle. Seeds reddish brown to dark brown, shiny.

Bloom Information

Bloom Color: White , Green
Bloom Time: Jun , Jul , Aug , Sep , Oct , Nov


USA: AL , FL , LA , MS , NC , TN , TX , VA
Native Habitat: Freshwater and brackish wetland habitats and hammocks.

National Wetland Indicator Status

This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1 (Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here for map of regions.

Web Reference

Webref 3 - Flora of North America (2014) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter

Additional resources

USDA: Find Amaranthus australis in USDA Plants
FNA: Find Amaranthus australis in the Flora of North America (if available)
Google: Search Google for Amaranthus australis


Record Modified: 2020-10-27
Research By: CBR

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