Invasive SpeciesVariable watermilfoil

Myriophyllum heterophyllum
NOT FOUND by outandabout
ID Confirmed
Quality checked by p.maloney
Peer reviewed by
Field Notes
We predicted that we would find invasive species at Highland Lake due the area's high human population, this is most populated county in Maine, extensive shoreline development, proximity to major roads, and the confirmed presence of invasive species in nearby bodies of water. Upon our arrival, we saw numerous purple flowers, frogs, dragonflies, an empty bottle and an air pump, plants that looked like grasses, and trees. Most of the trees were hardwoods, including birches and alders. A large great blue heron flew off when we arrived. The immediate area around us looked marshy. A sandy bottom substrate existed below our feet, constituting the boat ramp, but when walked near the aquatic plants the bottom became very muddy and soft. We saw plant debris on the bottom. The land around this section of the lake is very flat. The majority of the lake was not visible. This area may not reflect the degree of development along the rest of the lake. We did not see any house, docks, or boats from this spot, but Google Earth revealed many roads and houses in the area. The breeze was light, the sky partly cloudy, the temperature was warm, and it rained briefly during our visit. We were able to hear cars from this site.
Supporting Evidence
Photo of my evidence.
Most of the plants we found were "emergent," with large portions above the water's surface. Only one of our specimens qualified as submerged. Variable watermilfoil is a submerged plant. Only its white flowers stick above the surface. We did not see any flowers.
Photo of my evidence.
Variable water milfoil has whorled leaves, which are feather divided. If you viewed a segment of this plant, it would resemble a raccoon tail. The plant we examined did not have whorled, feather-divided leaves, nor did it look like the tail of a raccoon.
Photo of my evidence.
Variable milfoil has thick, reddish stems. Our specimen was green, without any red or thick segments. Our specimen was very thin and tangled easily.
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: 
Just looking around
Weed weasel
Photo of our sampling method.
Place Studied
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Map this species
N 43.752070 °
W -70.354540 °
Observation Site Information
A photo of our study site.
Freshwater - In a pond or lake
Trip Information
Highland Lake
Trip date: 
Thu, 2011-08-04 14:00
Town or city: 
Type of investigation: 
Species and Habitat Survey
MIDAS Code: 
Habitat Observations
Species diversity: 
Evidence of vectors: 
Boat ramp
Dirt road
Water temperature: 
Dissolved oxygen: 


Hey outandabout,

I really like your field note. Seems like you did your homework before your data collection work - great! And super that you found out and shared things (with sources!) about your lake that you couldn't see from your field site (like the fact that it is quite heavily developed). Your note really gives context to the observation you made, and makes me doubly glad that you didn't find M. heterophyllum there!

And you included a whole bunch of useful observations about the site - like the bottom type, etc.

Great method photo, too.

thanks for reporting!

Great pictures showing your evidence for NOT finding the species. A nice shot of weed weasel deployment, as well!!