Chelone obliqua. It's snake head in German, turtlehead in English, toadhead in Finnish, and turtle head in Swedish, and this photo shows why. Annala, Helsinki, Finland. Planted. 2004-09-11.

Chelone obliqua L.
Engl.: balmony, red turtlehead, bitter herb, chelone, glatte, salt-rheum weed, shellflower, snake-head, turtle-bloom, turtle-head, turtlehead.
Deu.: Schlangenkopf, Miesmäulchen, Schildblume.
Suom.: konnanyrtti.
Sven.: sköldpaddsört