Amaranthus tuberculatus (Moquin-Tandon) J.D. Sauer. Inland Water-hemp. Phen: Jul-Oct. Hab: Swamps, bottomlands, fields, disturbed areas. Dist: The exact boundaries of its native distribution are now obscure, perhaps approximately OH west to ND south to MS and TX.

Origin/Endemic status: Native

Taxonomy Comments: The two forms (sometimes treated as varieties or species) are discussed by Costea & Tardif (2003b) and Waselkov & Olsen (2014).

Synonymy: = Ar, C, FNA4, GW2, K3, K4, Mi, Mo2, NE, NY, Ok, RAB, Tn, W; > Acnida altissima (Riddell) Moq. ex Standl. – G; > Acnida altissima (Riddell) Moq. ex Standl. var. altissima – F; > Acnida altissima (Riddell) Moq. ex Standl. var. prostrata (Uline & Bray) Fernald – F; > Acnida altissima (Riddell) Moq. ex Standl. var. subnuda (S.Watson) Fernald – F; > Acnida concatenata Moq. – S, S13; > Acnida subnuda (S.Watson) Standl. – G, S; > Acnida tamariscina (Nutt.) Wood – F, G, S, S13, Tat, Tx, misapplied; > Acnida tuberculata (Moq. – S13; > Amaranthus rudis J.D.Sauer – GrPl, Il, K1, NcTx, Pa; > Amaranthus tamariscinus Nutt. – Sauer (1955), misapplied; > Amaranthus tuberculatus (Moq.) J.D.Sauer – GrPl, K1, Pa, Sauer (1955); > Amaranthus tuberculatus (Moq.) J.D.Sauer var. prostratus (Uline & Bray) Mohlenbr. – Il; > Amaranthus tuberculatus (Moq.) J.D.Sauer var. rudis (J.D.Sauer) Costea & Tardif – Costea & Tardif (2003b), Waselkov & Olsen (2014); > Amaranthus tuberculatus (Moq.) J.D.Sauer var. subnudus (S.Watson) Mohlenbr. – Il; > Amaranthus tuberculatus (Moq.) J.D.Sauer var. tuberculatus – Il, Costea & Tardif (2003b), Waselkov & Olsen (2014)

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: FACW
• Eastern Mountains and Piedmont: FACW
• Great Plains: FAC
• Midwest: OBL
• Northcentral & Northeast: OBL

Heliophily: 9