]> NEBC barcode-00306066 United States of America Massachusetts Blue Hills Reservation, Houghtons Pond Potamogeton pusillus subsp. gemmiparus (J. W. Robbins) R. R. Haynes & Hellquist (J. W. Robbins) R. R. Haynes & Hellquist 2010-08-16 16:39:25 F. C. Seymour