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Alligatorweed
(Alternanthera philoxeroides)
Found an invasive species? Register for a free login account, or submit a public report.
Species deemed as "Early Detection" are defined as being exotic, invasive species which fit any of the following descriptions:
1. Newly established in Pennsylvania.
2. Thought to be in Pennsylvania but not well documented.
3. Not found in Pennsylvania but expected to arrive and considered moderately invasive.
Alligator-weed
Alternanthera philoxeroides Photo credit: Melissa McMasters/Flickr
Red swamp crayfish
Procambarus clarkii Photo credit: © Ted van den Bergh/Flickr
Marsh thistle
Cirsium palustre Photo credit: © Rea Brinkhoff/Flickr
Giant snakehead
Channa micropeltes Photo credit: JW/Flickr
Early Detection Species
Species Profiles
View photos and profiles for many of the species listed in this category.
Not present: Species not yet found in Pennsylvania.
Uncommon: Species found in Pennsylvania, but still very rare.
Found only in its PA native range: This species is native to parts of Pennsylvania; if found in other parts of the state, it may be suspected of being an invasive species.
Note: Species list updated in September 2021.
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