Pickerelweed (Pontederia cordata) as described by Aquaplant, a site by Department of Wildlife and Fisheries Science Texas A&M University, College Station, Texas.
The site is meant to help pond owners with identification and management of aquatic vegetation.
"Pickerelweed is a perennial plant that can grow up to 3 1/2 feet tall. Leaves are shiny green, heart-to-lance shaped(up to 7 inches long) singly attached to a long petiole which grow in a rosette from the roots. Each stem can produce a terminal flower spike 3 to 4 inches long. The numerous tubular flowers on the spike are violet-blue in color. Each flower lasts only one day. Pickerelweed reproduces from seeds and rhizomes."
Read more on the following link:
http://aquaplant.tamu.edu/database/emergent_plants/pickerelweed.htm
http://aquaplant.tamu.edu/contents/about_aquaplant.htm
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