Rumex scutatus
Rumex scutatus (syn. Rumex alpestris) is a plant in the buckwheat family, used as a culinary herb. Its common names include French sorrel, buckler sorrel, shield-leaf sorrel, and sometimes the culinary name "green-sauce". As a culinary herb, it is used in salads, soups, and sauces (especially for fish). French sorrel tastes tart from its oxalic acid content, with a hint of lemon. Later in the season, it can be bitter. French sorrel is hardy in most regions, tolerating frost, full sun and short dry spells. It grows quickly to a clump up to  in diameter, with long leaves up to  wide. It is sometimes preferred for culinary uses to Rumex acetosa, garden sorrel. References

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scutatus
Herbs
Flora of Europe
Flora of Western Asia
Plants described in 1753
Taxa named by Carl Linnaeus