Flora of North America species comparison

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Potamogeton pusillus subsp. gemmiparus
Photo is of parent taxon

potamot gemmipare
Leaves

stipules convolute;

blade 1.1–6 cm × 0.2–0.7 mm, apex subulate, lacunae present or absent, 0–2 rows on each side of midrib;

veins 1.
Inflorescences

peduncles 1–3 per plant, cylindric;

spikes cylindric, continuous.
Fruits

obovoid, sides centrally concave;

beak median.

Potamogeton pusillus subsp. gemmiparus
Phenology Flowering and fruiting summer–fall.
Habitat Acid waters of lakes and streams
Elevation 0–100 m (0–300 ft)
Distribution
from FNA
CT; MA; ME; NH; NH; VT; QC
Discussion

Potamogeton pusillus subsp. gemmiparus is an uncommon taxon that superficially resembles subsp. pusillus. It can be separated, however, by its continuous inflorescences, whereas those of subsp. pusillus are interrupted.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 22.
Parent taxa Potamogetonaceae > Potamogeton > Potamogeton pusillus
Sibling taxa
P. pusillus subsp. pusillus, P. pusillus subsp. tenuissimus
Synonyms P. pusillus var. gemmiparus, P. gemmiparus
Name authority (J. W. Robbins) R. R. Haynes & Hellquist: Novon 6: 370. (1996)
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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