Potamogeton pusillus subsp. gemmiparus

(J. W. Robbins) R. R. Haynes & Hellquist

Novon 6: 370. 1996.

Common names: Potamot gemmipare
Endemic
Basionym: Potamogeton pusillus var. gemmiparus J. W. Robbins in A. Gray, Manual ed. 5, 489. 1867
Synonyms: Potamogeton gemmiparus
Treatment appears in FNA Volume 22.

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.


Phenology: Flowering and fruiting summer–fall.
Habitat: Acid waters of lakes and streams
Elevation: 0–100 m

Distribution

V22 88-distribution-map.jpg

Que., Conn., Maine, Mass., N.H., N.H., Vt.

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.

Selected References

None.

Lower Taxa

None.
Robert R. Haynes +  and C. Barre Hellquist +
(J. W. Robbins) R. R. Haynes & Hellquist +
Potamogeton pusillus var. gemmiparus +
Potamot gemmipare +
Que. +, Conn. +, Maine +, Mass. +, N.H. +  and Vt. +
0–100 m +
Acid waters of lakes and streams +
Flowering and fruiting summer–fall. +
Potamogeton gemmiparus +
Potamogeton pusillus subsp. gemmiparus +
Potamogeton pusillus +
subspecies +