]> GH barcode-00967202 United States of America Massachusetts Bartonia Ditch [Bartonia Ditch probably refers to A. Wheeler’s meadow where he found “Bartonia. tenella” (= Bartonia virginica) July 31, 1856] Potamogeton epihydrus Rafinesque Rafinesque 2018-09-24 11:05:42 H. D. Thoreau