LakeStewardship


Potamogetonaceae
Pondweed Family

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Potamogeton amplifolius - Bass Weed, Large-leaved Pondweed

Like many of the pondweeds, P. amplifolius has two types of leaves, a submerged form and a floating form. In this case, the submerged leaf is markedly different in color and shape. The submerged leaf is folded and curved and often brownish in color (taco-shaped), while the floating leaf is green and somewhat rounded and oblong in shape.
Potamogeton amplifolius
Floating and submerged leaves. Upper Saranac Lake, August 2002
Potamogeton amplifolius
Floating and submerged leaves. Upper Saranac Lake, August 2002
Potamogeton amplifolius
Submerged leaves. Upper Saranac Lake, August 2002
Potamogeton amplifolius
Submerged leaves. Upper Saranac Lake, August 2002
Potamogeton amplifolius
Floating leaves and flower stalk. Upper Saranac Lake, August 2002
Potamogeton amplifolius
Floating leaves and flower stalk. Upper Saranac Lake, August 2002
Potamogeton amplifolius
Submerged and floating leaves. Minerva Lake, July 2003
Potamogeton amplifolius
Submerged and floating leaves. Minerva Lake, July 2003
Potamogeton amplifolius
Floating leaves and flower stalk. Minerva Lake, July 2003

Potamogeton crispus - Curly-leaved Pondweed (INVASIVE)

P. crispus can be identified by its distinctive leaves. The leaves are stiff, have wavy edges, and a prominant toothed margin. The leaves also have distinctive veination, with a strong center vein with opposite side veins. The leaf margin is separated from the main leave by a thin vein that runs near the outside edge of the leaf. Leaves are usually close together with some branching near the ends, with a color from light green through brownish-red. Stems are slightly flattened.
Potamogeton crispus - growth habit in lake
Growth habit in lake. Mohegan Lake, May 2004
Potamogeton crispus - growth habit in lake
Growth habit in lake. Mohegan Lake, May 2004
Potamogeton crispus - growth habit in lake
Growth habit in lake. Mohegan Lake, May 2004
Potamogeton crispus - leaves at tip
Leaves at end of stalk. Mohegan Lake, May 2004
Potamogeton crispus - leaves at tip
Leaves at end of stalk. Butterfield Lake, June 2004
Potamogeton crispus - leaves at tip
Leaves at end of stalk. Butterfield Lake, June 2004
Potamogeton crispus - plant
Growth habit. Butterfield Lake, June 2004
Potamogeton crispus - plant
Growth habit. Butterfield Lake, June 2004
Potamogeton crispus - leaves at tip
Leaf up close. Butterfield Lake, June 2004
Potamogeton crispus - plant
Growth habit. Butterfield Lake, June 2004
Potamogeton crispus - leaves at tip
Leaves at end of stalk. Butterfield Lake, June 2004
Potamogeton crispus - leaves at tip
Leaf up close. Butterfield Lake, June 2004

Potamogeton diversifolius - Variable-leaved Pondweed

Line drawing of Potamogeton diversifolius
Line drawing
   

Potamogeton epihydrus - Leafy Pondweed

Potamogeton epihydrus growth habit
Growth habit. Minerva Lake, July 2004
Potamogeton epihydrus growth habit
Growth habit. Minerva Lake, July 2004
Potamogeton epihydrus - Surface leaves and fruiting structures
Surface leaves and fruiting structures. Minerva Lake, July 2004
Potamogeton epihydrus - Surface leaves and fruiting structures
Surface leaves and fruiting structures. Minerva Lake, July 2004
Potamogeton epihydrus - Surface leaves and fruiting structures
Surface leaves and fruiting structures. Minerva Lake, July 2004
Potamogeton epihydrus - closeup of fruiting structure
Closeup of fruiting structure. Minerva Lake, July 2004
Potamogeton epihydrus - Surface leaves and fruiting structures
Surface leaves and fruiting structures. Minerva Lake, July 2004
Potamogeton epihydrus - flowering structure
Flowering structure. Minerva Lake, July 2004
Potamogeton epihydrus - closeup of flowering structure
Closeup of flowering structure. Minerva Lake, July 2004
Potamogeton epihydrus - submerged leaves
Submerged leaves, young growth looking like P. robensii. Minerva Lake, July 2004
Potamogeton epihydrus - submerged leaves
Submerged leaves, young growth looking like P. robensii. Minerva Lake, July 2004
Potamogeton epihydrus - closeup of submerged leaf
Closeup of submerged leaves, showing characteristic lacunae band. Minerva Lake, July 2004
Potamogeton epihydrus - closeup of submerged leaf
Closeup of submerged leaves, showing leaf tip. Minerva Lake, July 2004
   

Potamogeton illinoensis - Illinois Pondweed

Line drawing of Potamogeton illinoensis
Line drawing
   

Potamogeton natans - Pondweed

P. natans has larger, oblong floating leaves than many similar-looking pondweeds
Potamogeton oblongus
Minerva Lake, July 2003
Potamogeton oblongus
Minerva Lake, July 2003
Potamogeton oblongus
Minerva Lake, July 2003
Potamogeton oblongus
Minerva Lake, July 2003
   

Potamogeton oakesianus - Pondweed

P. oakesianus is similar to P. natans
Potamogeton oblongus
Chub Pond, July 2003
Potamogeton oblongus
Chub Pond, July 2003
Potamogeton oblongus
Chub Pond, July 2003
Potamogeton oblongus
Chub Pond, July 2003
   

Potamogeton oblongus - Pondweed

As with many of the pondweeds, the fruiting structures of P. oblongus are important for identifying to species. There is little differentiation between submerged and floating leaves, however.
Potamogeton oblongus
Saranac River, upstream of Middle Saranac Lake, August 2002
Potamogeton oblongus
Saranac River, upstream of Middle Saranac Lake, August 2002
Potamogeton oblongus
Saranac River, upstream of Middle Saranac Lake, August 2002
Potamogeton oblongus
Saranac River, upstream of Middle Saranac Lake, August 2002
Potamogeton oblongus
Saranac River, upstream of Middle Saranac Lake, August 2002
Potamogeton oblongus
Saranac River, upstream of Middle Saranac Lake, August 2002
Potamogeton oblongus
Saranac River, upstream of Middle Saranac Lake, August 2002
   

Potamogeton perfoliatus - Clasping-leaved Pondweed

Common in lakes and ponds. Look for leaf bases that clasp stem and lack of stipule (appendage at base of leaf). Lower leaves tend to be somewhat larger than upper leaves. Can be mistaken for Eurasian watermilfoil (Myriophyllum spicatum) when seen from a distance due to similar growth habits (see last pictures in this section).
Potamogeton perfoliatus
Upper and lower leaves. Upper Saranac Lake, August 2002
Potamogeton perfoliatus
Upper leaves and flower. Upper Saranac Lake, August 2002
Potamogeton perfoliatus
Upper leaves and flower. Upper Saranac Lake, August 2002
Potamogeton perfoliatus
Lower leaves. Upper Saranac Lake, August 2002
Potamogeton perfoliatus
Lower leaves. Upper Saranac Lake, August 2002
 
Potamogeton perfoliatus growth habit in lake
Growth habit in lake. Upper Saranac Lake, August 2002
Potamogeton perfoliatus growth habit in lake
Growth habit in lake. Upper Saranac Lake, August 2002
Potamogeton perfoliatus growth habit in lake
Growth habit in lake. Upper Saranac Lake, August 2002

Potamogeton pusillus - Small Pondweed

This plant can be distinguished from Najas by the presence of the typical Potamogeton fruiting structure, a cluster of nutlets. This pondweed does not have floating leaves.
Line drawing of Potamogeton pusillus
Line drawing
Potamogeton pusillus growth habit
Growth Habit. Minerva Lake, 2003.
Potamogeton pusillus growth habit
Growth Habit. Minerva Lake, 2003.
Potamogeton pusillus closeup of fruting structure
Closeup of fruiting structure. Minerva Lake, 2003.
Potamogeton pusillus closeup of fruting structure
Closeup of fruiting structure. Minerva Lake, 2003.
Potamogeton pusillus growth habit
Growth Habit. Minerva Lake, 2003.
  Potamogeton pusillus growth habit
Growth Habit. Minerva Lake, 2003.
 

Potamogeton richardsonii - Clasping-leaved Pondweed

Common in lakes and ponds. Similar to P. perfoliatus except all leaves are large, stipular fibers are present at base of leaves, and inflorescence (flowering section) is longer.
Potamogeton richardsonii
Upper Saranac Lake, August 2002
Potamogeton richardsonii
Closeup on leaves. Upper Saranac Lake, August 2002
Potamogeton richardsonii
Closeup on upper leaves and inflorescence. Upper Saranac Lake, August 2002
Potamogeton richardsonii
Closeup on inflorescence. Upper Saranac Lake, August 2002
   

Potamogeton robensii - Robbins' Pondweed

Common in lakes and ponds, in deep or shallow water, generally growing close to bottom. Distinctive dark green, stiffish leaves in ranks of two.
Potamogeton robensii
Barger Pond, September 2002
Potamogeton robensii
Barger Pond, September 2002
Potamogeton robensii
Barger Pond, September 2002
Potamogeton robensii
Barger Pond, September 2002
Potamogeton robensii
Putnam County (Three Lakes), July 2003
Potamogeton robensii
Putnam County (Three Lakes), July 2003
Potamogeton robensii
Putnam County (Three Lakes), July 2003
Potamogeton robensii
Putnam County (Three Lakes), July 2003
 

Potamogeton spirillus -

Potamogeton spirillus growth habit
Growth habit. Minerva Lake, July 2003
Potamogeton spirillus upper leaves
Upper leaves. Minerva Lake, July 2003
Potamogeton spirillus submerged leaves
Submerged leaves. Minerva Lake, July 2003
Potamogeton spirillus fruiting structures
Fruiting structures. Minerva Lake, July 2003
Potamogeton spirillus submerged leaves
Submerged leaves. Minerva Lake, July 2003
Potamogeton spirillus submerged leaves
Submerged leaves. Minerva Lake, July 2003

Potamogeton tennesseensis -

Potamogeton tennesseensis - growth habit
Growth habit. Putnam County (Three Lakes), July 2003
Potamogeton tennesseensis - growth habit
Growth habit. Putnam County (Three Lakes), July 2003
 

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copyright © Michael R. Martin 2003-2015
Last updated: Friday, January 22, 2016 3:57 PM