Alternanthera philoxeroides
Alternanthera philoxeroides
(alligatorweed)
Plants
Exotic
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9 results for Alternanthera philoxeroides (alligatorweed)
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Specimen IDStateCountyLocalityYear HUC Number What's this? Drainage nameStatus
1889413 CAContra Costa[No locality description provided]2025 18040003 San Joaquin Delta 
1889828 CASacramento[No locality description provided]2025 18020111 Lower American 
1892160 CASacramento[No locality description provided]2025 18020163 Lower Sacramento 
1892177 CASacramento[No locality description provided]2025 18020163 Lower Sacramento 
1889372 CASan Diego[No locality description provided]2025 18070304 San Diego 
1889745 CASan Joaquin[No locality description provided]2025 18040003 San Joaquin Delta 
1889884 CASolano[No locality description provided]2025 18050001 Suisun Bay 
1889342 CAStanislaus[No locality description provided]2025 18040002 Lower San Joaquin River 
1890422 CATulare[No locality description provided]2025 18030007 Upper Kaweah 

Data Disclaimer: Number of records does not imply species abundance. This summary represent collection records only and may not reflect the actual distribution of established populations. These data are preliminary or provisional and are subject to revision. They are being provided to meet the need for timely best science. The data have not received final approval by the U.S. Geological Survey (USGS) and are provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the data.

Disclaimer:

The data represented on this site vary in accuracy, scale, completeness, extent of coverage and origin. It is the user's responsibility to use these data consistent with their intended purpose and within stated limitations. We highly recommend reviewing metadata files prior to interpreting these data.

Citation information: U.S. Geological Survey. [2026]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [4/19/2026].

Contact us if you are using data from this site for a publication to make sure the data are being used appropriately and for potential co-authorship if warranted.

For general information and questions about the database, contact Wesley Daniel. For problems and technical issues, contact Matthew Neilson.