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American Sweetflag (Acorus americanus (Raf.) Raf.)

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A wetland plant, native to North America.

It is difficult to get accurate information about this plant's range, because of inconsistency in reporting of this species relative to the introduced Acorus calamus.

Many populations are locally endangered, and listed as endangered in Pennsylvania.

Range - Expand

Native or Not Present

This tentative map is based on our own research. It may have limited data on Canada and/or Mexico, and there is some subjectivity in our assignment of plants as introduced vs. expanded. Read more in this blog post.


Shallow water in ponds.

Related to the introduced Acorus calamus, which is much more common in much of this species' range. Some sources do not distinguish the two plants, which can make it hard to find accurate info about either species.

Acorus americanus (American Sweetflag) | USDA PLANTS Database (About This Site)

Acorus americanus | Go Botany (About This Site)

Sweetflag | iNaturalist (About This Site)

Acorus americanus | Biota of North America Project (BONAP) (About This Site)

Acorus americanus | NatureServe Explorer (About This Site)

Acorus americanus | Flora of North America (About This Site)

Acorus americanus (Sweet-flag) | Minnesota Wildflowers (About This Site)