Northern? It's range gets farther north than southern water-plantain, and is a couple of hundred miles less going south. But mostly they overlap. You will note the pale pink shade here. All sources I've found say this has white petals. Pink is said to be limited to Eurasian plants, including Alisma plantago-aquatica. Our north and south plants used to be combined with that species. Those Eurasian plants have only appeared here in a remote spot in Alaska. Could this be another instance? Did the St. Lawrence Seaway strike again? Probably not. My two pink specimens that I sent to the University of Michigan Herbarium were confirmed as A. triviale. So heads up guys, America has barely pinkish water-plantains! With petals all of 6 millimeters long. USDA says the species grows in AK, AR, AZ, CA, CO, CT, IA, ID, IL, IN, KS, KY, MA, MD, ME, MI, MN, MO, MT, ND, NE, NH, NJ(E), NM, NV, NY, OH, OK, OR, PA(E), RI, SD, TN, VT, WA, WI, WY, AB, BC, MB, NB, NF, NS, NT, ON, PE, QC, SK, and YT. The distribution map in FNA agrees, and looks very amoebic, with limbs that barely reach many of the outer states and provinces. Sources agree that these should be in West Virginia, but apparently no specimens have been seen. Lenawee Co MI, 8/7/15.