Alternanthera philoxeroides
Alternanthera philoxeroides
(alligatorweed)
Plants
Exotic
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279 results for Alternanthera philoxeroides (alligatorweed)
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Click here for listing in all states

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Specimen IDStateCountyLocalityYear HUC Number What's this? Drainage nameStatus
1750541 CAButte[No locality description provided]2023 18020159 Honcut Headwaters-Lower Feather 
1750816 CAButte[No locality description provided]2023 18020159 Honcut Headwaters-Lower Feather 
1751426 CAButte[No locality description provided]2024 18020159 Honcut Headwaters-Lower Feather 
1741077 CAContra Costa[No locality description provided]2017 18050001 Suisun Bay 
1746472 CAContra Costa[No locality description provided]2020 18050001 Suisun Bay 
1747046 CAContra Costa[No locality description provided]2021 18050001 Suisun Bay 
1746801 CAContra Costa[No locality description provided]2021 18040003 San Joaquin Delta 
1747203 CAContra Costa[No locality description provided]2021 18040003 San Joaquin Delta 
1748038 CAContra Costa[No locality description provided]2022 18040003 San Joaquin Delta 
1748040 CAContra Costa[No locality description provided]2022 18040003 San Joaquin Delta 
1748214 CAContra Costa[No locality description provided]2022 18040003 San Joaquin Delta 
1747722 CAContra Costa[No locality description provided]2022 18040003 San Joaquin Delta 
1747739 CAContra Costa[No locality description provided]2022 18040003 San Joaquin Delta 
1748213 CAContra Costa[No locality description provided]2022 18040003 San Joaquin Delta 
1751939 CAContra Costa[No locality description provided]2023 18040003 San Joaquin Delta 
1750634 CAContra Costa[No locality description provided]2023 18040003 San Joaquin Delta 
1750707 CAContra Costa[No locality description provided]2023 18040003 San Joaquin Delta 
1750852 CAContra Costa[No locality description provided]2023 18040003 San Joaquin Delta 
1750706 CAContra Costa[No locality description provided]2023 18050001 Suisun Bay 
1887430 CAContra Costa[No locality description provided]2023 18040003 San Joaquin Delta 
1751734 CAContra Costa[No locality description provided]2024 18040003 San Joaquin Delta 
1751934 CAContra Costa[No locality description provided]2024 18040003 San Joaquin Delta 
1889413 CAContra Costa[No locality description provided]2025 18040003 San Joaquin Delta 
1725675 CAContra CostaGarden weed in Danville, CA. San Francisco Bay Area.2005 18050001 Suisun Bay 
1441792 CAContra CostaSan Francisco Bay Area Garden weed in Danville, CA.. Data provided by the participants of the Consortium of Calif. Herbaria (ucjeps.berkeley.edu/consortium/).2005 18050001 Suisun Bayestablished
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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. [2025]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [12/10/2025].

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.