An Old World waterside plant of the arum family, with leaves that resemble those of the iris. It is used medicinally and as a flavouring. Also called calamus.
- Acorus calamus, family Araceae.
- Flag iris and sweet flag are two delightful perennial plants which, although they don't come from the same family, enjoy similar growing conditions.
- In eastern Massachusetts they call the spikes of fruit of the sweet flag critch-crotches, probably from the zigzag lines which mark the divisions between each member of the spike and its neighbors.
- 7 John Ordway also mentions the cherries; he adds that William Bratton came across a large quantity of a plant they called sweet flag.
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