Parnassus-leaved water-plantain
It is an aquatic plant with crawling rhizomes. With 5 to 100 cm petiole, oval or elliptical leaves, 2-10 × 1.5-7 cm, deep rounded base, obtuse apex. Paniculated inflorescences of 20 to 35 cm. With 3 verticillate flowers and pedicels of 2.5 to 4 cm. Oval petals, larger than sepals.