Pond-lilies are another water lover that reward a close study. So wade right in, and make your own decision on what to call them. You might as well, because it seems like no two botanists can agree about pond-lilies. Some see one world-wide species. Others split them up. In North America we have between one and thirteen species. I've chosen to go with local authority, Michigan Flora, and call this one N. advena. N. lutea might do just as well. Whatever you call it, it is a dramatically interesting flower. The column in the center of this two-inch flower is the pistil. The reddish rays on it are the pollen collectors. The small petals are hidden below the stamens. The round yellow sepals surround the flower. Opinions about pollination are also evolving. Long thought to be beetle fertilized, it now seems to be more up to whatever shows up to check out this yellow ball ut on the water. Want to do some while you're there? With so much disagreement, it's hard to pin down a range. USDA says AL, AR, CT(S), DE, GA, IL, IN, KS, KY, LA, MA, MD, ME(S), MI, MN, MO, MS, NC, NH, NJ, NY, OH, OK, PA, SC, TN, TX, VA, VT, WI, WV, and ON. Lenawee Co MI, 8/11/11.