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Pickerel weed (Pontederia cordata).

Pickerel weed is an aquatic or marsh perennial with a cluster of erect arrowhead-shaped leaves arising from a single basal clump. Throughout late spring and summer, pickerelweed produces showy 6-8 in spires of violet-blue flowers standing on stalks 2-3 ft high.

If you want more information about this flower, just search the plant's Latin (botanical) name on Google:

pickerel weed

cattail dwarf bluebell hardy water lily lotus
Papyrus pickerel weed pitcher plant water lily
water hyacinth orange watersnowflake waterlily victoria