Disclaimer:

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.

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Common name: large-flower primrose-willow

Synonyms and Other Names: Ludwigia grandiflora ssp. hexapetala, Ludwigia hexapetala, Ludwigia uruguayensis, Jussiaea grandiflora

Taxonomy: available through www.itis.gov

Native Range:

Alaska	Hawaii	Puerto Rico & Virgin Islands	Guam Saipan

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

References: (click for full references)

Nesom, G.L. and J.T. Kartesz. 2000. Observations on the Ludwigia uruguayensis complex (Onagraceae) in the United States. Castanea. 65(2): 123-125.

Wagner, W.L., P.C Hoch and P.H. Raven 2007. Systematic Botany Monographs: Revised Classification of the Onagraceae. 83: 243 pp.

Zardini, E. M., H. Gu & P. H. Raven 1991. On the separation of two species within the Ludwigia uruguayensis complex (Onagraceae). Systematic Botany. 16(2): 242–244.

Zardini, E.M., H. Gu, and P.H. Raven. 1992. Erratum: on the separation of two species within the Ludwigia uruguayensis complex (Onagraceae). Systematic Botany. 17(4): 692.

Other Resources:
US Fish and Wildlife Service Ecological Risk Screening Summary for Ludwigia grandiflora

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.