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FNA | Family List | FNA Vol. 22 | Potamogetonaceae | Potamogeton

16c. Potamogeton pusillus subsp. gemmiparus (J. W. Robbins) R. R. Haynes & Hellquist, Novon. 6: 370. 1996.

Potamot gemmipare

Potamogeton pusillus Linnaeus var. gemmiparus J. W. Robbins in A. Gray, Manual ed. 5, 489. 1867; P. gemmiparus (J. W. Robbins) Morong

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.

Flowering and fruiting summer--fall. Acid waters of lakes and streams; 0--100 m; Que.; Conn., Maine, Mass., N.H., N.H., Vt.

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.


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