https://www.minnesotawildflowers.info/flower/hooded-arrowhead
Sagittaria montevidensis subsp. calycina (Hooded Arrowhead): Minnesota Wildflowers
Photos and information about Minnesota flora - Hooded Arrowhead: whorls or racemes of 3-petaled, ¾-inch white flowers with a spot of yellow-green at the base...
sagittaria montevidensisminnesota wildflowerssubspcalycinahooded