UW Burke Herbarium species comparison

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Potamogeton alpinus

northern pondweed, reddish pondweed
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.
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.

Potamogeton alpinus
Flowering time June-August
Habitat Calm water of 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.
[WildflowerSearch map]
[BONAP county map]
Origin Native
Conservation status Not of concern
Sibling taxa
P. amplifolius, P. berchtoldii, P. crispus, P. epihydrus, P. fibrillosus, P. foliosus, P. friesii, P. gramineus, P. illinoensis, P. natans, P. nodosus, P. obtusifolius, P. praelongus, P. pusillus, P. richardsonii, P. robbinsii, P. strictifolius, P. zosteriformis
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Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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