Arrowhead (Sagittaria latifolia)

http://minneflora.com/classify/Alismataceae/Sagittaria/latifolia.html

Arrowhead is a perennial emergent aquatic plant native to North America. It is can be common in shallow wetlands even in polluted and degraded wetlands. Its can be seen in virtually in any kind of wetland, but it does not tolerate heavily shaded wetlands or it is not usually seen in fens. It is in the Alismataceae family or the Water Plantain family. I have in my own experience seen a lot of this in Midewin National Tallgrass Prairie and in other wetlands in the Cook County Forest Preserves near Chicago. It looks very much like arrow arum, but the leaves have palmate venation and the flowers are three-petaled and on a raceme as opposed to pinnate venation and a having a flower composed of a spathe and spadix.