Invasive SpeciesPurple loosestrife

Lythrum salicaria
FOUND by Linda McD
ID Confirmed
Quality checked by 4 Seasons
Peer reviewed by
Field Notes
Last summer as I was driving past Long Lake, I noticed pink---and part of my brain went on alert. "Is that loosestrife or fireweed?" Usually it's fireweed, thank goodness. But this time, it was loosestrife. I went back to investigate. Elsewhere, the ditches were filled with cattails, but here, it was nearly all loosestrife. This invader has spread to the roadside, and I think it's because there used to be a large perennial garden right there. I used to go there to purchase perennials. I'm betting I could have bought loosestrife if I wanted. It's only the second instance of loosestrife I've confirmed around Madawaska. That was right right across the street from the elementary school. Someone dug it out. Although technically this may be within the town of Ste. Agathe.
A sketch of our study site.
Supporting Evidence
Photo of my evidence.
There are five petals on each little flower. It's bright purple. The flowers are in a bunch, sort of a pointy bunch.
Photo of my evidence.
I checked and the stem is square. I broke to it off to see.
Photo of my evidence.
The leaves are opposite and whorled. They are lance shaped. They are spotty because it's fall-ish, so they are old.
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Scientific name:
Lythrum salicaria
Common name:
Purple loosestrife
Sampling method: 
Just looking around
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 47.251756 °
W -68.290428 °
Observation Site Information
A photo of our study site.
Upland - Developed areas
Trip Information
Around Madawaska
Trip date: 
Sun, 2014-08-24 19:20
Town or city: 
Type of investigation: 
Species Survey
Saint John


Good pictures

Have you seen galerucella beetles or anytipe of beetle like Japanese beetles

Great shot of those little bundles of tiny seeds. Thanks Moss Boss for passing the picture along.


Linda McD requested that this great photo of the flowers post-bloom be added. Here it is! loosestrifeflowers.jpg

Good observing Linda McD. Your evidence is solid and leaves no doubt that this is Lythrum salicaria up in the Saint John Valley.. Such a hardy and beautiful flower. Too bad it has such a high biotic potential.

Glad to hear that you have been looking and not finding Loosestrife in the area. Perhaps the climate may be a limiting factor. Thanks so much for being on the lookout all this time.