Invasive SpeciesOriental bittersweet

Celastrus orbiculatus
FOUND by Leaf Peeper
South Portland
ID Confirmed
Quality checked by Vector Inspector
Peer reviewed by
Field Notes
I am happy today because the weather is great and I just ate a wonderful peanut butter and jelly sandwich. I see a park with grass, ornamental plants, walkers, and quite a few squirrels. I see a small muddy creek and a busy road. I smell cold and fall. I hear people talking, cars driving and leaves rustling in the wind. The park is used by many people and so there are many vectors for the movement of invasive species. I was surprised that I saw so many plants that I think could be invasive species in a public park. I have questions about dark spots that I saw on the leaves of some of the maple trees. I wonder if this is some type of fungus growing on the tree.
Supporting Evidence
Photo of my evidence.
Oriental bittersweet has bright red fruit with thin yellow skins after August and the plant that I am investigating now (November) had the same. The fruit that I observed looked very much like the picture of the fruit on the Oriental Bittersweet species card.
Photo of my evidence.
The plant that I am investigating grows as a vine and wraps itself around trees as Oriental Bittersweet is described as doing on the species card.
Photo of my evidence.
The leaf arrangement (alternate), type (simple), shape (oval), and edge (toothed) of the species I am investigating are all the same as the description of the leaves of Oriental Bittersweet. Also, the leaves of the species I am investigating look like the leaf photos on the Oriental Bittersweet species card, the leaves have one main vein down the middle with smaller veins coming off of this vein.
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Scientific name:
Celastrus orbiculatus
Common name:
Oriental bittersweet
Sampling method: 
Just looking around
Photo of our sampling method.
Place Studied
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Map this species
N 43.635060 °
W -70.251170 °
Observation Site Information
A photo of our study site.
Upland - Developed areas
Trip Information
Mill Creek Park
Trip date: 
Wed, 2009-11-04 14:45
Town or city: 
South Portland
Type of investigation: 
Species Survey


Hi! great evidence and I love hoe all of your photos are focused

Great picture. Thanks.

Did you see any branches that were tightly wrapped around a tree/branch? That's what my group found and I'm pretty sure it was confirmed as Bittersweet. If you can, you should definitely go back to the spot that you observed and look for those. Hope that hint helps. :)
Sincerly yours,

We also feel that you have provided successful information to assist people in stopping the invasive species. However we do feel that you could have taken more picture evidence to help with your discovery. Good job!

Are you guys doing anything to stop it, or are you just letting it be? Hopefully it can be stopped and once it is, good riddance(not to say that it doesn't have a right to exist, it does, just not here).

Its an invasive species. It basically has no enemies...

This is definitely Oriental bittersweet. Keep an eye on those trees to see how their health stands up to their climbing, smothering neighbor in the coming years!

Hey there. My group was looking for the same thing here at Massabesic Middle. We thought we didn't find it, but know that we are looking at your pictures, we think it might be it but we are not sure.

Thanks again!