The Nonindigenous Occurrences section of the NAS species profiles has a new structure. The section is now dynamically updated from the NAS database to ensure that it contains the most current and accurate information. Occurrences are summarized in Table 1, alphabetically by state, with years of earliest and most recent observations, and the tally and names of drainages where the species was observed. The table contains hyperlinks to collections tables of specimens based on the states, years, and drainages selected. References to specimens that were not obtained through sighting reports and personal communications are found through the hyperlink in the Table 1 caption or through the individual specimens linked in the collections tables.

Ludwigia hexapetala
Ludwigia hexapetala
(six petal water primrose)

Copyright Info
Ludwigia hexapetala (Hook. & Arn.) Zardini, H.Y. Gu & P.H. Raven

Common name: six petal water primrose

Synonyms and Other Names:  Ludwigia grandiflora ssp. hexapetala (Hook. & Arn.) G.L. Nesom & Kartesz

Taxonomy: available through www.itis.govITIS logo

Identification: Bright yellow blooms

Size: 90-120 cm

Native Range: Ludwigia hexapetala is native to South America.

There is questions if the species is native to the southeastern US. Its earliest records date to South Carolina in 1844 and Georgia in 1864; its unclear if these records reflect a lack of early collections or introductions (Jacono 2014).


Hydrologic Unit Codes (HUCs) Explained
Interactive maps: Point Distribution Maps

Nonindigenous Occurrences:

Table 1. States with nonindigenous occurrences, the earliest and latest observations in each state, and the tally and names of HUCs with observations†. Names and dates are hyperlinked to their relevant specimen records. The list of references for all nonindigenous occurrences of Ludwigia hexapetala are found here.

StateFirst ObservedLast ObservedTotal HUCs with observations†HUCs with observations†
CA1902202022Butte Creek; Clear Creek-Sacramento River; Cottonwood-Tijuana; Coyote; Honcut Headwaters-Lower Feather; Lower American; Lower Sacramento; Newport Bay; Russian; Sacramento-Stone Corral; Salinas; San Diego; San Joaquin Delta; San Luis Rey-Escondido; San Pablo Bay; Santa Clara; Santa Margarita; Tomales-Drake Bays; Upper Cache; Upper Cosumnes; Upper Putah; Ventura
GA202020201Lower Flint
LA201420162Boeuf; East Central Louisiana Coastal
MS200820081Upper Tombigbee
NC195720208Deep; Haw; Lower Cape Fear; New River; Upper Cape Fear; Upper Catawba; Upper Neuse; Upper Tar
OR200720183Lower Rogue; Middle Rogue; Upper Willamette
SC1981202015Black; Broad-St. Helena; Cooper; Enoree; Lake Marion; Lower Broad; Lower Catawba; Lower Savannah; Middle Savannah; Salkehatchie; Saluda; Santee; South Carolina Coastal; Tyger; Upper Broad
WA199420181Lower Columbia-Clatskanie

Table last updated 9/18/2021

† Populations may not be currently present.

Means of Introduction: The ornamental plant trade (Jacono 2014).

Impact of Introduction:
Summary of species impacts derived from literature review. Click on an icon to find out more...

EcologicalEconomicHuman Health

Author: Procopio, J. and Daniel, W.M.

Revision Date: 7/24/2019

Citation Information:
Procopio, J. and Daniel, W.M., 2021, Ludwigia hexapetala (Hook. & Arn.) Zardini, H.Y. Gu & P.H. Raven: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?speciesID=2979, Revision Date: 7/24/2019, Access Date: 9/18/2021

This information is preliminary or provisional and is subject to revision. It is being provided to meet the need for timely best science. The information has not received final approval by the U.S. Geological Survey (USGS) and is 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 information.


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. [2021]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [9/18/2021].

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