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Which Alismatales family includes only the circumpolar bog plant Scheuchzeria palustris?

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Flowering rush — Alismatales Showy and delicate flowers of the flowering rush (*Butomus umbellatus*).

The plant family that includes only the circumpolar bog plant Scheuchzeria palustris is the Scheuchzeriaceae. This family is monotypic, meaning it consists of only this single species, which is frequently found in quaking bogs throughout the Northern Hemisphere.12