What is "pontederia cordata"

Pickerel \Pick"er*el\, n. [Dim. of Pike.] [Written also pickerell.]

1. A young or small pike. [Obs.]

   Bet [better] is, quoth he, a pike than a pickerel.
   --Chaucer.

2. (Zo["o]l.)

   1. Any one of several species of freshwater fishes of the genus Esox, esp. the smaller species.

   2. The glasseye, or wall-eyed pike. See Wall-eye.

      Note: The federation, or chain, pickerel ( Esox reticulatus) and the brook pickerel ( Esox Americanus) are the most common American species. They are used for food, and are noted for their voracity. About the Great Lakes the pike is called pickerel.

      Pickerel weed (Bot.), a blue-flowered aquatic plant ( Pontederia cordata) having large arrow-shaped leaves. So called because common in slow-moving waters where pickerel are often found.

Pontederia cordata, common name pickerelweed (USA) or pickerel weed (UK), is a monocotyledonous aquatic plant native to the American continent. It grows in a variety of wetlands, including pond and lake margins across an extremely large range from eastern Canada south to Argentina. A few examples include northern rivers, the Everglades and Louisiana.