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Amaranthus australis (A. Gray) J.D. Sauer. Southern Water-hemp, Careless. Phen: May-Aug. Hab: Tidal marshes, freshwater wetlands (swamps, strands, sloughs, marshes), ditches, disturbed areas. Dist: E. NC, TN, LA, and TX south into West Indies, Gulf Coast of Mexico (CAM, ROO, TAB, TAM, VER), and n. South America; perhaps adventive in some of our range, from an original distribution on the Gulf Coast, in FL, and southward into the New World tropics.

Origin/Endemic status: Native

Other Comments: This annual can get as large as 9 m tall and 30 cm diameter at the base of the stem!

Synonymy ⓘ: = FNA4, GW2, K1, K3, K4, Mex, NcTx, WH3, Sauer (1955); = Acnida australis A.Gray – S13; = n/a – C, F, RAB; > Acnida alabamensis Standl. – S; > Acnida cuspidata Bertero ex Spreng. – S, Tx

Links to other floras: = Amaranthus australis - FNA4

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Wetland Indicator Status:

  • Atlantic and Gulf Coastal Plain: OBL
  • Eastern Mountains and Piedmont: OBL
  • Great Plains: OBL

Heliophily ⓘ: 8

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image of plant© Keith Bradley | Original Image ⭷
image of plant© Mary Keim, some rights reserved (CC BY-NC-SA) source CC-BY-NC-SA, permission granted to NCBG | Original Image ⭷
image of plant© Will McFarland, some rights reserved (CC BY), uploaded by Will McFarland source CC-BY | Original Image ⭷
image of plant© Eric M Powell, some rights reserved (CC BY-NC), uploaded by Eric M Powell source CC-BY-NC, permission granted to NCBG | Original Image ⭷
image of plant© Eric M Powell, some rights reserved (CC BY-NC), uploaded by Eric M Powell source CC-BY-NC, permission granted to NCBG | Original Image ⭷
image of plant© Eric M Powell, some rights reserved (CC BY-NC), uploaded by Eric M Powell source CC-BY-NC, permission granted to NCBG | Original Image ⭷
image of plant© Eric M Powell, some rights reserved (CC BY-NC), uploaded by Eric M Powell source CC-BY-NC, permission granted to NCBG | Original Image ⭷

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