Pickerelweed, a native species, has been added to the USWildflowers database (09/15/2015.)  Scientific name is Pontederia cordata. Photo below was taken in a cove of Baie Fine of the North Channel of Lake Huron in Ontario, Canada on August 13, 2015. Go to the Pickerelweed detail page for more photos and information.

Pickerelweed – Pontederia cordata