| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Acoraceae | Acorus americanus ssp. americanus | American Calamus, Sweetflag | Marshes, wet meadows, other wet areas, limey seeps. | Nova Scotia west to Alaska, south to n. New Jersey, District of Columbia (allegedly), c. Ohio, c. Indiana, c. Illinois, Iowa, Nebraska, Montana, Idaho, and Washington. Because this species has not generally been recognized in floras, its distribution is poorly known; additional distributional records should be expected and sought. |  (c) Martineau, Nate - CC-BY-NC, permission granted to NCBG |
| Acoraceae | Acorus calamus | European Calamus, Sweetflag | Marshes, wet meadows, other wet areas. | Native of Eurasia, now widespread in e. North America. |  (c) Fleming, Gary P. |
| Acoraceae | Acorus gramineus | Japanese Sweetflag, Grassleaf Sweetflag | Naturalized in seepages and in sand and gravel bars along streams, in suburban settings. | Native of e. Asia. Reported for City of Alexandria (Simmons et al. 2020). |  (c) Y, Toby - CC-BY |