Arrowheads are common in shallow water. Their tall spikes of one inch or more flowers are certainly eye catching. It would make it easy, even enjoyable, for Indian ladies to wade along a shore and dig the tubers. Arrowheads, also called wapato or duck potato, have tubers that were a frequent food. You could walk along in mud, feeling for golf-ball size tubers with your toes. Conveniently, when you free them they float to the surface. Now you can sometimes just get them from natural food stores. The arumleaf species grows in AK, AZ, CA, CO, CT(S), IA, ID, IL, IN, KS, MA(T), ME, MI, MN, MT, ND, NE, NH(T), NJ(E), NM, NV, NY, OH(T), OK, OR, PA, SD, TX, UT, VT, WA, WI, WY, AB, BC, LB, MB, NB, NS, NT, ON, QC, SK, and YT. Lenawee Co MI, 8/7/11.