Invasive SpeciesJapanese barberry

Berberis thunbergii
FOUND by cabbot11
Falmouth Maine
ID Confirmed
Quality checked by Eli Wilson
Peer reviewed by
Field Notes
The day we collected data it was very hot and dry. We also collected when it was more room temperature and we did not notice a change in the plant. Our study site is 50 meters long and has part of a developed area for part of the study site and has forest for part of the study site. The study site is in a forest near a playground and has 2 'trails' running on either side of the study site. The invasive species is not taking over the area or the native species because the invasive species is nowhere near the native species and does not seem to be expanding very quickly or affecting any of the other plants in the area. The percent cover of the quadrat is between 3/4 and the whole quadrant.
Supporting Evidence
Photo of my evidence.
The leaves. Leaf patterns alternate, leaf type is simple, leaf shape is oval and the leaves are smooth.
Photo of my evidence.
The stem is zig zag shape and not very thick. There is one thorn at each joint on the stem.
Photo of my evidence.
There are oval shaped reddish purple berries along the stem.
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Scientific name:
Berberis thunbergii
Common name:
Japanese barberry
Count of individuals: 
3/4 - Completely covered
Fruit (plants)
Sampling method: 
Quadrat (randomized- placement)
Quadrat (user-placement)
Photo of our sampling method.
Place Studied
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Map this species
N 43.739550 °
W -70.275930 °
Observation Site Information
A photo of our study site.
Upland - Forest
Trip Information
Falmouth Elementary back woods
Trip date: 
Mon, 2016-09-26 08:15
Town or city: 
Falmouth Maine
Type of investigation: 
Species and Habitat Survey
Habitat Observations
Species diversity: 
2 different species
Evidence of vectors: 
Walking trail
Tree canopy cover: 
Between 1/4 and 1/2
Soil moisture: 


Excellent marked-up evidence photos! Did you take them all yourselves? The first two look like they were taken in the spring...or this is a super healthy plant that's thriving well into the fall!

Thanks for looking for Japanese barberry.