Water Plantain (Alisma Tricale)

Native: http://www.naturemanitoba.ca/botany/wildPlants/CommonWaterPlantain.pdf

Large water-plantain and its relative small water-plantain (Alisma subcordatum) look quite similar. Both plants have small flowers with three petals on greatly branched stems. They differ in the size of the flowers. Large water-plantain petals are around 1/4 inch long; petals of small water-plantain are 1/8 inch or less.

Water Plantain