Hydrilla verticillata
Hydrilla verticillata
(hydrilla)
Plants
Exotic
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14 results for Hydrilla verticillata (hydrilla)
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Specimen IDStateCountyLocalityYear HUC Number What's this? Drainage nameStatus
274385 GU Agaga River [unspecified location]2010 22010000 Guamestablished
862534 GU Agana Springs1978 22010000 Guamestablished
274345 GU Ajayan River [unspecified location within system]2005 22010000 Guamestablished
274352 GU Almagosa drainage [unspecified location within drainage]2004 22010000 Guamestablished
274361 GU Atantano River2006 22010000 Guamestablished
274376 GU Chaot River [unspecified location]2004 22010000 Guamestablished
1463809 GU Fena Valley Reservoir at boat ramp, NW shoreline opposite spillway1982 22010000 Guamestablished
887708 GU Fena Valley Reservoir, Guam1955 22010000 Guamestablished
1463808 GU Fena Valley Reservoir, Guam1962 22010000 Guamestablished
274404 GU Lonfit River2004 22010000 Guamestablished
887711 GU Masso Reservoir2006 22010000 Guamestablished
1463810 GU Pago River between the gaging station and its confluence with the Sigua River1983 22010000 Guamestablished
274461 GU Tolaeyuus River [unspecified location]2005 22010000 Guamestablished
887712 GU Ugum River, near Ugum Water Treatment Plant2006 22010000 Guamestablished

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.

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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 [12/5/2025].

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