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Arrowheads have edible tubers that were an important food for Indians.  I wade around in the muck just for fun.  For the Indians around Watkins Lake, it must have been a way of life.  Another of yesterday's finds was wild rice, which also grows in shallow water.  The presence of plentiful food sources made this a very active area for Indians.  Many artifacts, including fire circles, have been found.

Sagittaria is a nearly worldwide genus.  It's likely a primitive food almost everywhere.