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Key to Potamogeton

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https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=39493

1 Stipular sheaths of submersed leaves adnate with leaf blade base, the tip usually projecting as a ligule Key to Potamogeton, Key A: pondweeds with adnate sheaths
1 Stipular sheaths of submersed leaves free from the leaf blade base, or with only a few adnate, the ligule not obvious.
2 Submersed leaves linear, thread-like or ribbon-like, 0.1-10 mm wide Key to Potamogeton, Key B: pondweeds with connate leaves and submersed leaves 0.1-10 mm wide
2 Submersed leaves broadly linear-oblong to lanceolate, linear-lanceolate, elliptic or nearly orbicular, 10-58 mm wide (occasional stranded forms lack submersed leaves) Key to Potamogeton, Key C: pondweeds with connate leaves and submersed leaves 10-58 mm wide

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Key to Potamogeton