Page authors: David Giblin, Don Knoke
Amaranthus tuberculatus
rough-fruited waterhemp, tall waterhemp

Distribution: Cosmopolitan weed found throughout North America.

Habitat: Moist or wet disturbed areas, particularly in association with agriculture or roadsides.

Flowers: April-June

Origin: Introduced from the Great Plains of the central United States

Conservation Status: Not of concern


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Accepted Name:
Amaranthus tuberculatus (Moq.) J.D. Sauer
Publication: MadroƱo. 13: 18. 1955. 1955.

Synonyms & Misapplications:
Acnida altissima Riddell ex Moq.
Acnida altissima Riddell ex Moq. var. prostrata (Uline & W.L. Bray) Fernald
Acnida altissima Riddell ex Moq. var. subnuda (S. Watson) Fernald
Acnida concatenata (Moq.) Small
Acnida subnuda (S. Watson) Standl.
Acnida tamariscina (Nutt.) Alph. Wood
Acnida tamariscina (Nutt.) Alph. Wood var. concatenata (Moq.) Uline & W.L. Bray
Acnida tamariscina (Nutt.) Alph. Wood var. tuberculata (Moq.) Uline & W.L. Bray
Acnida tuberculata Moq.
Amaranthus ambigens Standl.
Amaranthus rudis J.D. Sauer [KZ99]
Amaranthus tamariscinus Nutt.
Additional Resources:

PNW Herbaria: Specimen records of Amaranthus tuberculatus in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Amaranthus tuberculatus checklist entry.

E-Flora BC: Amaranthus tuberculatus atlas page.

CalPhotos: Amaranthus tuberculatus photos.

USDA Plants: Amaranthus tuberculatus information.

3 photographs:
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