Flora of the Canadian Arctic Archipelago

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S.G. Aiken, M.J. Dallwitz, L.L. Consaul, C.L. McJannet, R.L. Boles, G.W. Argus, J.M. Gillett, P.J. Scott, R. Elven, M.C. LeBlanc, L.J. Gillespie, A.K. Brysting, H. Solstad, and J.G. Harris

Potamogeton pusillus L.

Potamogetonaceae, Pondweed family.

Published in Sp. Pl. 127. 1753.

Synonymy. Potamogeton panormitanus Biv. ex Guss. Fl. Sic. Syn. 1: 207. 1843.

Vegetative morphology. Plants never vegetatively proliferating by bulbils on stems or leaves, in inflorescences, from gemmiphores and gemmae, or by fragmentation; without milky juice; not glandular viscid. Aerial stems plants aquatic without aerial stems. Leaves dying annually and non-persistent. Leaves grass-like.

Reproductive morphology. Petals absent. Stamens present; 4.

Chromosome information. 2n (2x)= 26. Palmgren (1939, Sweden); Takusagawa (1961, Japan);

2n = 28. Harada (1942a, 1942b, 1956); see also Bolkhovskikh et al. (1969).

North American distribution. Continental Northwest Territories, Newfoundland (var. tenuissimus).

General notes. Potamogeton pusillus s.s. has been very much confused with the more northern P. berchtoldii. Several distinct and taxonomically assumed important differences separate them. Some sterile hybrids are reported but no fertile intermediates. They seem to be clear species. Haynes and Hellquist (2000) treated them as two (largely sympatric) subspecies but give no arguments for this. Elven et al. (2003) proposed treating the taxa as two species.

Scoggan's (1978) report of P. pusillus s.s. north to Hudson Bay (York Factory) suggested to Elven that there is some Canadian confusion in separating between P. berchtoldii and P. pusillus. Haynes and Hellquist (2000) excluded the Hudson Bay occurrences but mapped occurrences along Mackenzie River to the sea.

There are three vegetative specimens annotated by Haynes and Hellquist (1973) as "probably P. pusillus var. pusillus" collected further "up north" than 67°C on the Mackenzie River. There are specimens at CAN from 64–67°N in Western Greenland, but no reports from the Arctic Archipelago are known in 2003.


This publication is available on the internet (posted May 2011) and on CD-ROM (published in 2007). These versions are identical in content, except that the errata page for CD-ROM is accessible on the main index page of the web version.

Recommended citation for the web-based version of this publication: Aiken, S.G., Dallwitz, M.J., Consaul, L.L., McJannet, C.L., Boles, R.L., Argus, G.W., Gillett, J.M., Scott, P.J., Elven, R., LeBlanc, M.C., Gillespie, L.J., Brysting, A.K., Solstad, H., and Harris, J.G. 2007. Flora of the Canadian Arctic Archipelago: Descriptions, Illustrations, Identification, and Information Retrieval. NRC Research Press, National Research Council of Canada, Ottawa. http://nature.ca/aaflora/data, accessed on DATE.

Recommended citation for the CD-ROM version of this publication: Aiken, S.G., Dallwitz, M.J., Consaul, L.L., McJannet, C.L., Boles, R.L., Argus, G.W., Gillett, J.M., Scott, P.J., Elven, R., LeBlanc, M.C., Gillespie, L.J., Brysting, A.K., Solstad, H., and Harris, J.G. 2007. Flora of the Canadian Arctic Archipelago: Descriptions, Illustrations, Identification, and Information Retrieval. [CD-ROM] NRC Research Press, National Research Council of Canada, Ottawa.

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