Potamogeton alpinus |
Potamogeton strictifolius |
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northern pondweed, reddish pondweed |
narrowleaf pondweed |
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Habit | 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. |
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Flowers | Inflorescence generally < 3 cm, floating to emergent; peduncle stiff. |
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Fruit | Around 2.5 mm, keels 1 or 3, generally, beaked, sides concave to convex. |
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Potamogeton alpinus |
Potamogeton strictifolius |
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Flowering time | June-August | July-September |
Habitat | Calm water of lakes and slow streams. | Alkaline water, lakes and slow streams. |
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.
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Occurring east of the Cascades crest in Washington, where known only from Okanogan County; Yukon Territory to Washington, east across the northern U.S. and Canada to eastern North America.
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Origin | Native | Native |
Conservation status | Not of concern | Not of concern |
Sibling taxa | ||
Web links |
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