This section is from the book "Who's Who Among The Wild Flowers", by W. I. Beecroft. Also available from Amazon: A Field Guide to Edible Wild Plants.
Acorus Calamus. Arum Family. June - Aug.
Found in wet, swampy places. Maine, south and west to Minnesota, Iowa, and Kansas.
Tiny, compactly covering a long, slender, greenish club, which grows from the side of a two-edged stem.
Long, narrow, sword-like. Rootstock aromatic.

Sweet Flag.
 
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