Invasive SpeciesPurple loosestrife

Lythrum salicaria
FOUND by MaineTeacher
ID Confirmed
Quality checked by J.Adams
Peer reviewed by
Field Notes
Sketch of the quadrat zone
A sketch of our study site.
Supporting Evidence
Photo of my evidence.
My partner and I spotted this plant about 30 centimeters from the edge of a small pond. The plant itself is approximately 1.6 meters tall. Upon further investigation, we discovered that the largest flower spike is approximately 25 centimeters long and contains clusters of purple flowers.
Photo of my evidence.
The stem of this plant has a unique rectangular prism shape and contains long, thin, blade-like leaves which are opposite from one another.
Photo of my evidence.
The individual flowers have about 6 petals each, arranged in a star-like pattern.
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Scientific name:
Lythrum salicaria
Common name:
Purple loosestrife
Count of individuals: 
Flower (plants)
Pollinators (plants)
Sampling method: 
Quadrat (user-placement)
Photo of our sampling method.
Place Studied
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Map this species
N 46.912960 °
W -67.824190 °
Observation Site Information
A photo of our study site.
Upland - Developed areas
Trip Information
Limestone Pond
Trip date: 
Wed, 2015-08-05 14:38
Town or city: 
Type of investigation: 
Species and Habitat Survey
Habitat Observations
Species diversity: 
7 different species
Evidence of vectors: 
Recent disturbance
water dam
Tree canopy cover: 
Soil moisture: 


No doubt you found Lythrum salicaria. Your flower photos leave not doubt. I really like your "rectangular prism" stem description as well. You must be a math teacher.

I must agree that first picture is absolutely stunning. Loosestrife is such a pretty flower when in bloom, which helped with its proliferation all over North America. Thanks for looking, finding and documenting. It is appreciated.


Wow! That first photo is so awesome. I know this is an invasive, but that pinky-purple is so pretty. Were these plants a little pinker than normal? I also love the scenery in the background of that first photo.

I'm no expert, but aside from the striking color, this looks like loosestrife to me. Great stem photo, too.