Invasive SpeciesWater chestnut

Trapa natans
NOT FOUND by BioGalileoBaxter
2009-10-22
Portland, ME
ID Confirmed
Quality checked by
Peer reviewed by
Field Notes
Supporting Evidence
Photo of my evidence.
On the Trapa natans the leaf shape is triangular and toothed edges, but on our evidence the leaf is circular with smooth edges.
Photo of my evidence.
We found these floating on the surface, but this has one leaf per stem and on the Trapa natans it has two leaves per stem.
Photo of my evidence.
On the Trapa natans there is a lump on the stem(the chest nut), but there is none on the stem that we have found.
Species Observation: Species Looked For
Did you find it?: 
I think I did not find it
Scientific name:
Trapa natans
Common name:
Water chestnut
Count of individuals: 
50+
Coverage: 
Between 1/4 and 1/2
Reproduction: 
Flower (plants)
How big is it?: 
5 - 10 cm
Is it male or female?: 
Can't tell
Sampling method: 
Weed weasel
Photo of our sampling method.
Place Studied
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Map this species
Latitude: 
N 43.676480 °
Longitude: 
W -70.287700 °
Observation Site Information
A photo of our study site.
Name:
BioGalileoBaxter's visit to Pond in Baxter Woods, Portland, ME (Galileo)
Habitat: 
Freshwater - By water's edge
Trip Information
Name:
Pond in Baxter Woods, Portland, ME (Galileo)
Trip date: 
Thu, 2009-10-22 13:25
Town or city: 
Portland, ME
Type of investigation: 
Species and Habitat Survey
Ecosystem: 
Freshwater
Watershed: 
Presumpscot
Sampling Method: 
Just looking around
Net
Trap
Weed weasel
Nearest waterbody: 
MIDAS Code: 
Habitat Observations
Species diversity: 
4 different species
Evidence of vectors: 
Walking trail
People
Water temperature: 
6.8°C
pH: 
6.0
Dissolved oxygen: 
5.0mg/L

Comments

Submitted by JMcPhedran on Wed, 2010-03-31 16:30.

Hi -- You probably know we

Hi -- You probably know we don't have Trapa natans yet in Maine (as far as we know), so I sure am glad you didn't find it. The State of Vermont has spent millions of dollars removing Trapa natans from Lake Champlain over the years -- it's not something we want to have to deal with here.

You did well in comparing leaf and stem characteristics between your plant and Trapa.

Finally, what do you think it is?

(My guess: Nymphaea odorata; see what you think:
http://www.mainevolunteerlakemonitors.org/mciap/herbarium/FragrantWaterl...)

Thanks and keep searching!

Submitted by SALSES on Wed, 2009-12-02 14:45.

Pictures

Good pictures from all angles of the plant. NiCe jOb! :)