Orobanche flava? (Polish: Zaraza żółta)
A parasite (broomrape) of butterbur.
NOTE: In [the vicinity of] the observed site 3 species of Orobanche have already been reported in botanical sources: O. elatior, O. alsatica and O. lutea.
However in the pictures attached I cannot see any host plants typical for the mentioned species [Centaurea scabiosa, Peucedanum cervaria, Medicago etc.], though they could have been present somewhere in the indirect neighbourhood..
Can these individuals be Orobanche caryophyllea ? It parasitises on Galium sp. which was present there [see the pictures attached].