Invasive SpeciesVariable watermilfoil

Myriophyllum heterophyllum
NOT FOUND by go science
South Portland
ID Confirmed
Quality checked by go science
Peer reviewed by hof2000
Field Notes
The area is developed for recreational use. We heard lawn mowers, airplanes overhead, jingling dog collars and song birds. We saw people and dogs walking the trails, a concrete retaining wall on the edge of the pond, a wood footbridge, managed trails, trees overhanging the pond, trash in the water, people fishing and bees on plants. We smelled sweet newly mown grass and dog poop. The elevation of this area was 39 meters. The dissolved oxygen in the pond was 5 PPM.
Supporting Evidence
Photo of my evidence.
Similar to the data sheet with green whorls, but no red stem and not feather divided.
Photo of my evidence.
This plant had a reddish, brown plant stem, but very different leaf structure.
Photo of my evidence.
Another species. This collected one is green, whorled, but had bladders. We suspect it to be bladderwort.
Species Observation: Species Looked For
Did you find it?: 
I think I did not find it
Scientific name:
Myriophyllum heterophyllum
Common name:
Variable watermilfoil
Sampling method: 
Weed weasel
Photo of our sampling method.
Place Studied
We’re sorry, JavaScript is required to view the map. If JavaScript is you may wish to upgrade to a newer browser in order to view this map.
Map this species
N 43.627676 °
W -70.254309 °
Observation Site Information
A photo of our study site.
Freshwater - In a pond or lake
Trip Information
Hinckley Park
Trip date: 
Thu, 2011-08-04 14:00
Town or city: 
South Portland
Type of investigation: 
Species and Habitat Survey
MIDAS Code: 
Habitat Observations
Species diversity: 
Evidence of vectors: 
Walking trail
Water temperature: 
Dissolved oxygen: 


You caught a textbook shot of the weed weasel in mid-air! Nice.

Your species images are good, too. Nice and clear. I particularly like that you included the pencil for scale.

Sounds like this little pond sees a lot of action. Is dog poop or other nutrients/ pollutants getting into the pond? Did it look like there was a lot of growth of aquatic plants? If not, why do you think there weren't?

Good to know this neighborhood treasure doesn't have M. heterophyllum in it! Thanks for looking.