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American sweet flag is common on east bank of Columbia Basin and occurs patchily on east bank of East Lagoon. Nearly identical to the (introduced) Eurasian sweet flag (Acorus calamus). The former has 3-6 major veins running the length of the leaf while the latter has only a single vein; the two are difficult to distinguish. The inflorescence is cigar-shaped and covered with hundreds of tiny (sterile) flowers.

Acorus

Acorus americanus

American sweet-flag [Blooms: May-Jun]