*Acorus calamus Linnaeus. European Calamus, Sweetflag. Phen: May-Jun. Hab: Marshes, wet meadows, other wet areas. Dist: Native of Eurasia, now widespread in e. North America.

Origin/Endemic status: Eurasia

Taxonomy Comments: Populations of A. calamus in our area are apparently sterile triploids introduced from Europe, though diploid and tetraploid populations of A. calamus are known from Asia.

Other Comments: The aromatic rhizome and leaves have been used medicinally and candied as a confection.

Synonymy: = Ar, ETx1, FNA22, Il, K1, K3, K4, Mi, Mo1, NcTx, NE, NY, Ok, Pa, Tx, Va, Spaulding et al (2019); < Acorus americanus (Raf.) Raf. – W; < Acorus calamus L. – C, F, G, GrPl, GW1, NeUS, RAB, S

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