]> GH barcode-01746133 United States of America Pennsylvania 4 1/2 mi WSW of Wyalusing Potamogeton pusillus subsp. tenuissimus (Mertens & Koch) R. R. Haynes & Hellquist (Mertens & Koch) R. R. Haynes & Hellquist 2020-11-18 10:39:42 H. A. Wahl F. W. Potter and R. F. Browning