(Rumex thyrsiflorus) Thyrse Sorrel

Rumex thyrsiflorus, also known commonly as the compact dock or thyrse sorrel, is a perennial herb, which grows in meadows and wasteland in most parts of Europe. It is somewhat similar to common sorrel (Rumex acetosa).
en.wikipedia.org

https://en.wikipedia.org/wiki/Rumex_thyrsiflorus