Invasive SpeciesCurly leaf pondweed

Potamogeton crispus
NOT FOUND by TheRussianTortoises
ID Confirmed
Quality checked by Team Killer Bees
Peer reviewed by Team Mildew
Field Notes
We found a similar plant to the invasive species we were looking for but the plant we found was proven not to be Potamogeton Crispus. We know it is not Potamogeton Crispus because Potamogeton Crispus is a submerged species and the species we found was on soil above the water.
Supporting Evidence
Photo of my evidence.
We found a similar plant but it was proven not to be Potamogeton Crispus because the leaves are long oval shaped, not long and jagged.
Photo of my evidence.
We know it is not the invasive species we were looking for because the species was not submerged and did not have a thick stem.
The invasive species we were looking for is a submerged species so we know that we did not find Potamogeton Crispus.
Species Observation: Species Looked For
Did you find it?: 
I think I did not find it
Scientific name:
Potamogeton crispus
Common name:
Curly leaf pondweed
Sampling method: 
Quadrat (user-placement)
Photo of our sampling method.
Place Studied
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Map this species
N 43.449240 °
W -70.783160 °
Observation Site Information
A photo of our study site.
Freshwater - By water's edge
Trip Information
Mousam River
Trip date: 
Thu, 2015-10-15 08:00
Town or city: 
Type of investigation: 
Species Survey
Mouse River Watershed
MIDAS Code: 


Greetings Russian Tortoises!

Thank you so much for making your observations and reporting in on your findings. I agree with your assessment that the plant in the photo is not Curly-leaf pondweed.

One of the biggest challenges to hunting for curly leaf pondweed this time of year, is that this particular invasive plant starts growing very early in the season (sprouting in the late fall and growing through the winter under the ice!) and starts decaying early as well (generally by early to mid summer). By this time of year, all that may be visible are tiny decomposing fragments left over from last summer's growth, a single leaf or seed stalk. Such tiny fragments might easily be overlooked!

Milfoils such as variable milfoil and Eurasion milfoil, on the other hand, are very hardy and will still be growing this time of year. They would, therefore, be easier to spot. A better time to look for CLP would be in the summer.

Thank you again SO much for keeping an eye out for invasive aquatic plants. It has been informed citizen scientists just like you who have found almost all of the known invasive aquatic plant infestations in Maine. The earlier we find these invaders, the better chance we have of getting rid of them!

Keep up the great work!

Roberta Hill
Invasive Species Program Director
Maine Volunteer Lake Monitoring Program