Invasive SpeciesGlossy buckthorn

Frangula alnus
FOUND by 2018ctc
Falmouth Maine
ID Questioned
Quality checked by Mr. Wilson
Peer reviewed by
Field Notes
The day we went out to Mackworth Island in Falmouth, Maine was October 4. We planed to do a transect thought the area to look for our species. We walked along a path on the island that goes all the way around the whole island. The weather was about 55-60 degrees inland and had a heavy wind about 10-15 knots with gusts about 20. Me and my group walked about ¾ of the way around the island. Everyone in my group had found their species that were Asian Bittersweet, Gaint Knotweed, Japanese Barberry, Morrow’s Honeysuckle, and Multiflora Rose. It took me I while to found my invasive species of Glossy Buckthorn but we found it at GPS coordinates of N 43.6906 W -70.2316. The plant that I found didn’t look like it was causing problems but on Mackworth, there is so much Japanese barberry and giant knotweed. While we were looking for the invasives we saw many different birds, squirrels, chipmunks, and moss on lots of the exposed rocks.
A sketch of our study site.
Supporting Evidence
Photo of my evidence.
One way I know I found Glossy Buckthorn was because of it white raised pores that cover the plant's whole stem.
Photo of my evidence.
Another way I know that this is Glossy Buckthorn is because of its alternative stem pattern on the branches of the plant.
Photo of my evidence.
The final way I know that this is Glossy Buckthorn is because of its 3-6 cm oval shaped leaves that are dark and have hair on the underside of the leaves.
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Scientific name:
Frangula alnus
Common name:
Glossy buckthorn
Sampling method: 
Photo of our sampling method.
Place Studied
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Map this species
N 43.690600 °
W -70.231600 °
Observation Site Information
A photo of our study site.
Upland - Forest
Trip Information
2018 Mackworth Upland
Trip date: 
Thu, 2018-10-04 15:06
Town or city: 
Falmouth Maine
Type of investigation: 
Species Survey


This is not Glossy Buckthorn. The leaves are toothed and they have insect damage. Glossy Buckthorn has "entire" leaf edges (No teeth). Young paper birches have bark very similar to Glossy Buckthorn including the white pore spots called lenticels. Very easy to confuse them. And because buckthorn is an alien invasive plant there are little or no insects that can attack it. They have not evolved a way around the chemical defenses built into the leaves.