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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key to Potamogeton

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1 Stipular sheaths of submersed leaves adnate with leaf blade base, the tip usually projecting as a ligule
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
..2 Submersed leaves broadly linear-oblong to lanceolate, linear-lanceolate, elliptic or nearly orbicular, 10-58 mm wide (occasional stranded forms lack submersed leaves)
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