Acoraceae | Acorus americanus ssp. americanus | American Calamus, Sweetflag | Marshes, wet meadows, other wet areas, limey seeps. | NS west to AK, south to n. NJ, DC (allegedly), c. OH, c. IN, c. IL, IA, NE, MT, ID, and WA. Because this species has not generally been recognized in floras, its distribution is poorly known; additional distributional records should be expected and sought. | 
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Acoraceae | Acorus calamus | European Calamus, Sweetflag | Marshes, wet meadows, other wet areas. | Native of Eurasia, now widespread in e. North America. | 
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