Invasive SpeciesHydrilla

Hydrilla verticillata
NOT FOUND by BioNewtonGreen
2009-10-23
Portland, ME
ID Confirmed
Quality checked by
Peer reviewed by
Field Notes
i like to learn new things we liked climbing out on the log it was very cold we had to continue to change our location
Supporting Evidence
Photo of my evidence.
The leafs were growing under water . They were about 7 to 13 CM with 4 pedals at top . The leaf shape is a bundle.
Photo of my evidence.
The plant is growing under water. The plant we found has more leaves than the picture with hydrilla.
Species Observation: Species Looked For
Did you find it?: 
I think I did not find it
Scientific name:
Hydrilla verticillata
Common name:
Hydrilla
Count of individuals: 
Coverage: 
Between 1/4 and 1/2
Reproduction: 
Pollinators (plants)
How big is it?: 
0 - 2 cm
Is it male or female?: 
Sampling method: 
Weed weasel
Photo of our sampling method.
Place Studied
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Map this species
Latitude: 
N 43.684360 °
Longitude: 
W -70.304990 °
Observation Site Information
A photo of our study site.
Name:
BioNewtonGreen's visit to Pond in Evergreen Cemetery, Portland, ME (Newton)
Habitat: 
Freshwater - In a pond or lake
Trip Information
Name:
Pond in Evergreen Cemetery, Portland, ME (Newton)
Trip date: 
Fri, 2009-10-23 09:15
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: 
0 different species
Evidence of vectors: 
the water
Water temperature: 
6.9°C
pH: 
5.0
Dissolved oxygen: 
6.0mg/L

Comments

Submitted by JMcPhedran on Wed, 2010-03-31 15:47.

hydrilla look-alike

Thanks for keeping an eye out for hydrilla. It's hard to tell for absolute certainty that this is NOT hydrilla but based on the photographs I believe the identification is correct.

A few thoughts you might consider in future searches for hydrilla:
-You described leaf shape as a "bundle;" I'm not familiar with that term. Rather than leaf shape, are you referring to the leaf arrangement, i.e., how the leaves attach to the stem? If that's true, I suggest you use the term "whorled" next time.

-You note that the leaves were 7 to 13 cm -- were the leaves themselves that long or were the stems that long? 7 to 13 cm is long for hydrilla or it's look-alike, common waterweed (Elodea sp).

-You also note that the plant you found has more leaves than the picture of hydrilla. If you're talking about the number of leaves per whorl, it's usually the other way around. That is, hydrilla usually has a greater number of leaves per whorl than does the native waterweed.

Thanks again -- keep searching!

Submitted by TheSuperHeroes on Thu, 2009-11-19 12:03.

Nice job

I find it a relief that you haven't found hydrilla. If so, it would be pretty bad!