Page author: Kevin Armitano
Potamogeton alpinus
northern pondweed, reddish pondweed

Flowers: June - August

Origin: Native

Conservation Status: Not of concern


Annual, perennial herb, slender, rhizomed; stems greater than 100 cm, branched, branches not many, cylindric.


Various shades of red; submersed sessile, 2-8 x 1-2 cm, lanceolate to elliptic-oblong, tapered to both ends, entire, tip blunt, veins 7-9; floating 0 or short-petioled, lanceolate, base tapered, veins 7-15; stipules beyond 3 cm, free, membranous, early-deciduous.


Inflorescence generally < 3 cm, floating to emergent; peduncle stiff.


Around 2.5 mm, keels 1 or 3, generally, beaked, sides concave to convex.

Accepted Name:
Potamogeton alpinus Balbis
Publication: Misc. Bot. 13. 1804. 1804.

Synonyms & Misapplications:
Potamogeton alpinus Balbis ssp. tenuifolius (Raf.) Hultén [JPM]
Potamogeton alpinus Balbis var. subellipticus (Fernald) Ogden [IMF6]
Potamogeton alpinus Balbis var. tenuifolius (Raf.) Ogden [Peck]
Potamogeton tenuifolius Raf.
Potamogeton tenuifolius Raf. var. subellipticus Fernald
Additional Resources:

PNW Herbaria: Specimen records of Potamogeton alpinus in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Potamogeton alpinus checklist entry.

E-Flora BC: Potamogeton alpinus atlas page.

CalPhotos: Potamogeton alpinus photos.

USDA Plants: Potamogeton alpinus information.

0 photographs:
Group by