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Which arrowhead species is cultivated in China for edible tubers?

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

The arrowhead species cultivated in China for its edible tubers is Sagittaria sagittifolia.1

This plant belongs to the genus Sagittaria, which is part of the Alismataceae family within the order Alismatales. While various species in this genus are known for their edible parts, S. sagittifolia is specifically noted for its agricultural use in China.12