2024 Edition • Donate • Get the App • Cite this Page
X

Colors

Data mode

Account

Login
Sign up

Support FSUS...

We've finished our 2024 fundraiser. Many thanks to those who have given! It's not too late to support us (click here)...

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 Stuckenia

Copy permalink to share

1 Leaf apex acute, mucronate or apiculate; proximal stipular sheaths not inflated; stems abundantly branched, especially on distal portions; fruits distinctly beaked; [relatively widespread in our region]
1 Leaf apex notched, obtuse, or round, rarely apiculate; proximal stipular sheaths often inflated; stems sparsely branched on distal portions; fruits without beak; [PA and OH northwards].
  2 Stipules without ligules or these < 2 mm on stipules of the upper stem; summit of midstem stipules inflated at least 2× the width of stem; fruit 3-3.8 mm long.
  2 Stipules with distinct ligules to 20 mm long, especially on stipules of the upper stem; summit of midstem stipules tight to stem, about the same width as stem; fruit 2-3 mm long.
    3 Plants 10-30 cm long; stipules on lower portion of stem tightly clasping or slightly enlarged, persistent; fruits common.
    3 Plants 20--100 cm long; stipules on lower portion of stem inflated, disintegrating with age; fruits often absent.