]> A barcode-00892156 United States of America Massachusetts Concord: S side of town of Concord on W side of Masachusetts route 126; Walden Pond, cove near NW shore of pond Ludwigia alternifolia Linnaeus Linnaeus 2020-04-25 10:07:08 D. E. Boufford, B. A. Connolly, C. C. Davis & Y. Hou