Species: 

Alternanthera philoxeroides

Common Name: 

alligator weed

Systems Affected (standardized): 

riparian/aquatic

Regions(s) present (updated by AB): 

SE

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Impacts: 

Forms dense mats that crowd out native species and impede recreational activities such as boating, swimming, and fishing and animal movement. Restricts oxygen levels of water, increases sedimentation. Impaired drainage of waterways can lead to more frequent flooding.

Source? likely to be reintroduced: 

In the USA, A. philoxeroides was probably introduced in contaminated ship ballast water, with the earliest herbarium specimen dating from South Carolina in 1885. The risk of introduction of A. philoxeroides is very high. Because this species is able to grow in both aquatic and terrestrial habitats, grows vigorously and spreads from floating fragments, it has a great potential to increase its present distribution into new areas.

Info Blurb: 

Forms dense mats that crowd out native species, impede recreational activities, decrease oxygen levels, and increase sedimentation. Can restrict waterways, leading to more frequent flooding. Because this species is able to vigorously grow in both aquatic and terrestrial habitats and spreads from floating fragments, it has the potential to expand its distribution into new areas.

Native Regions in OK: 

NONE

Current and past designations: 

OWL

Present in OK?

Yes

Present in Bordering States?

TX, KS, AR, LA

Has Legal Status in BS?

AR NW, TX NP