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*Alternanthera philoxeroides (Martius) Grisebach. Alligator-weed. Phen: Mar-Oct. Hab: Floating in mats on the surface of the waters of blackwater rivers, sloughs, ditches, ponds, and in very moist soil of ditches and shores. Dist: Native of tropical America. This plant is a serious weed of natural areas. Reported for s. IN by Bill Thomas (pers.comm., 2022).

Origin/Endemic status: Neotropics

Synonymy : = Ar, C, FNA4, Il, K1, K3, K4, NcTx, Ok, RAB, S13, Tn, Tx, Va, WH3; = Achyranthes philoxeroides (Mart.) Standl. – S; = n/a – F, Tat

Links to other floras: = Alternanthera philoxeroides - FNA4

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Wetland Indicator Status:

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

Heliophily : 9

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image of plant© Gary P. Fleming | Original Image ⭷
image of plant© Gary P. Fleming | Original Image ⭷
image of plant© Gary P. Fleming | Original Image ⭷

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See something wrong or missing on about Alternanthera philoxeroides? Let us know here: (Please include your name and email if at all complicated so we can clarify if needed.) We greatly appreciate feedback, and will include updates from you in our next webapp update, which can take a few months.