Flora of North America species comparison

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Stuckenia filiformis subsp. filiformis

Stuckenia filiformis subsp. occidentalis
Photo is of parent taxon

fineleaf pondweed
Photo is of parent taxon

potamot filiforme occidental, slender-leaf pondweed, western fineleaf pondweed, western pondweed
Stems

10–30 cm.

20–100 cm.
Leaves

stipules persistent, those on proximal portion of stem tightly clasping or slightly enlarged; 0.2–0.5 mm wide.

stipules disintegrating with age, those on proximal portion of stem inflated;

blade inflated; 0.2–5 mm wide.
Inflorescences

peduncles with flowers and/or fruits 4 cm or more apart.

peduncles with flower and/or fruits adjacent or separated by less than 2 cm.
Fruits

common.

often absent.

Stuckenia filiformis subsp. filiformis

Stuckenia filiformis subsp. occidentalis
Phenology Flowering summer. Flowering spring–early fall.
Habitat Calcareous waters of ponds, lakes, and streams Calcareous waters, mainly in cold, slow- to fast-flowing streams and rivers, occasionally in standing waters of ponds and lakes
Elevation 0–915 m (0–3000 ft) 0–2195 m (0–7200 ft)
Distribution
from FNA
AK; NT; YT; Greenland; Europe; Asiaasia
[BONAP county map]
from FNA
AK; CO; IA; ID; ME; MI; MN; MT; ND; NH; NM; NV; NY; OR; UT; VT; WA; WI; WY; AB; BC; MB; NB; NL; NS; NT; NU; ON; PE; QC; SK; YT
[BONAP county map]
Discussion

No specimens have been seen from British Columbia or Nunavut, but the subspecies is to be expected there.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

In the Great Lakes region, the name Potamogeton [Stuckenia] vaginatus has often been misapplied to this taxon. The distribution of S. vaginatus is further to the north and west than the Great Lakes region, however. Stuckenia filiformis subsp. occidentaliis rarely produces fruit in the eastern portion of its range, while to the north and west it commonly fruits. This subspecies is very similar to Potamogeton rostratus Hagström ([the combination does not exist within the genus Stuckenia)] of Asia and may prove to be the same taxon. Both grow in similar habitats. The proximal stipules are much enlarged and inflated, and the leaves are generally wider than the other subspecies.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 22. FNA vol. 22.
Parent taxa Potamogetonaceae > Stuckenia > Stuckenia filiformis Potamogetonaceae > Stuckenia > Stuckenia filiformis
Sibling taxa
S. filiformis subsp. alpina, S. filiformis subsp. occidentalis
S. filiformis subsp. alpina, S. filiformis subsp. filiformis
Synonyms Potamogeton marinus var. occidentalis
Name authority unknown (J. W. Robbins) R. R. Haynes: Novon 8: 241. (1998)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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