Petasites radiatus, = Nardosmia laevigata (Willd.) DC.. This semiaquatic plant rimming fresh and swiftly running rivulets is very rarely seen flowering.

The Bol'shoi Tesh River 1.5 km upstream of its confluence with the Malyi Tesh, the village Kuzedeevo environs, Novokuznetsk District, Kemerovo Province, West Siberia, Russia. 26th May 1995. O. Kosterin.