• Amaranthus Adanson, 1763 (unaccepted) [Family: Amaranthaceae]
• Amaranthus Linnaeus, 1753 [Family: Amaranthaceae]
• Amaranthus Müller in Knorr, 1766 (uncertain) [Family: Cnidaria (awaiting allocation)]
• Amaranthus acanthochiton Sauer
• Amaranthus acutilobus Uline & Bray
• Amaranthus albomarginatus Uline & Bray accepted as Amaranthus californicus (Moq.) S. Wats.
• Amaranthus albus Linnaeus
• Amaranthus altissimus Riddell accepted as Amaranthus tuberculatus (Moq.) Sauer
• Amaranthus ambigens Standl. accepted as Amaranthus tuberculatus (Moq.) Sauer
• Amaranthus annectens Blake accepted as Amaranthus greggii S. Wats.
• Amaranthus arenicola I.M. Johnston
• Amaranthus ascendens Loisel. accepted as Amaranthus blitum Linnaeus
• Amaranthus australis (A. Gray) J.D. Sauer, 1955
• Amaranthus berlandieri (Moq.) Uline & Bray accepted as Amaranthus polygonoides Linnaeus
• Amaranthus bigelovii Uline & Bray
• Amaranthus blitoides S. Wats.
• Amaranthus blitum Linnaeus
• Amaranthus bouchonii Thellung accepted as Amaranthus powellii S. Wats.
• Amaranthus bracteosus Uline & Bray accepted as Amaranthus powellii S. Wats.
• Amaranthus brownii Christoph. & Caum
• Amaranthus californicus (Moq.) S. Wats.
• Amaranthus cannabinus (Linnaeus) J.D. Sauer, 1955
• Amaranthus caudatus Linnaeus
• Amaranthus chihuahuensis S. Wats.
• Amaranthus chlorostachys Willd. accepted as Amaranthus hybridus Linnaeus
• Amaranthus crassipes Schlecht.
• Amaranthus crispus (Lesp. & Thev.) N. Terracc.
• Amaranthus cruentus Linnaeus
• Amaranthus deflexus Linnaeus
• Amaranthus dubius Mart. ex Thellung
• Amaranthus edulis Speg. accepted as Amaranthus caudatus Linnaeus
• Amaranthus fimbriatus (Torr.) Benth. ex S. Wats.
• Amaranthus floridanus (S. Wats.) Sauer
• Amaranthus gangeticus Linnaeus accepted as Amaranthus tricolor Linnaeus
• Amaranthus gracilis Desf. accepted as Amaranthus viridis Linnaeus
• Amaranthus graecizans auct. non L. accepted as Amaranthus albus Linnaeus
• Amaranthus greggii S. Wats.
• Amaranthus hybridus Linnaeus
• Amaranthus hypochondriacus Linnaeus
• Amaranthus incurvatus Tim. ex Gren. & Godr. accepted as Amaranthus hybridus Linnaeus
• Amaranthus leaf mottle virus
• Amaranthus leucocarpus S. Wats. accepted as Amaranthus hypochondriacus Linnaeus
• Amaranthus lineatus R. Br.
• Amaranthus lividus Linnaeus accepted as Amaranthus blitum Linnaeus
• Amaranthus microphyllus Shinners accepted as Amaranthus californicus (Moq.) S. Wats.
• Amaranthus muricatus (Gillies ex Moq.) Gillies ex Hicken
• Amaranthus myrianthus Standl. accepted as Amaranthus greggii S. Wats.
• Amaranthus obcordatus (Gray) Standl.
• Amaranthus palmeri S. Wats.
• Amaranthus paniculatus Linnaeus accepted as Amaranthus cruentus Linnaeus
• Amaranthus patulus Bertol. accepted as Amaranthus hybridus Linnaeus
• Amaranthus polygonoides Linnaeus
• Amaranthus powellii S. Wats.
• Amaranthus pringlei S. Wats.
• Amaranthus pubescens (Uline & Bray) Rydb. accepted as Amaranthus albus Linnaeus
• Amaranthus pumilus Raf.
• Amaranthus retroflexus Linnaeus
• Amaranthus rudis Sauer
• Amaranthus scleropoides Uline & Bray
• Amaranthus spinosus Linnaeus
• Amaranthus tamariscinus auct. non Nutt. accepted as Amaranthus rudis Sauer
• Amaranthus thunbergii Moq.
• Amaranthus torreyi accepted as Amaranthus watsonii Standl.
• Amaranthus torreyi (Gray) Benth. ex S. Wats.
• Amaranthus torreyi auct. non (Gray) Benth. ex S. Wats. accepted as Amaranthus bigelovii Uline & Bray
• Amaranthus tricolor Linnaeus
• Amaranthus tuberculatus (Moq.) Sauer
• Amaranthus viridis Linnaeus
• Amaranthus viridus auct. non L. accepted as Amaranthus blitum Linnaeus
• Amaranthus viscidulus Greene accepted as Amaranthus powellii S. Wats.
• Amaranthus watsonii Standl.
• Amaranthus wrightii S. Wats.