Potamogeton alpinus
northern pondweed, reddish pondweed
Specimens
Photos

Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains and northern Great Plains; also in eastern North America.

Habitat: Calm water of lakes and slow streams.

Flowers: June-August

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern

Description:
General:

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

Leaves:

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.

Flowers:

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

Fruit:

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

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

OregonFlora: Potamogeton alpinus information

E-Flora BC: Potamogeton alpinus atlas page

CalPhotos: Potamogeton alpinus photos

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