Very distinctive leaves usually in a marsh where you hopefully have your wellies on.

Comarum palustre 19Jul2015 NS6257 MP

Comarum palustre 25Jun2017 NS8569 MP

It likes being in standing water.

Comarum palustre 28May2017 NS8267 PW

Invading out into the shallows from a shore.

Comarum palustre NS 8070 30Sep2017 PW

Comarum palustre NN8943 24June2018 PW