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.

Hymenachne amplexicaulis
(West Indian marsh grass)
Native Transplant

Copyright Info
Hymenachne amplexicaulis (Rudge) Nees

Common name: West Indian marsh grass

Synonyms and Other Names: Hymenachne acutigluma auct. non (Steud.) Gilliland

Taxonomy: available through www.itis.govITIS logo

Native Range: South and Central America
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 Hymenachne amplexicaulis are found here.

StateFirst ObservedLast ObservedTotal HUCs with observations†HUCs with observations†
FL1957201920Alafia; Apalachee Bay-St. Marks; Big Cypress Swamp; Caloosahatchee; Crystal-Pithlachascotee; Everglades; Florida Southeast Coast; Hillsborough; Kissimmee; Lake Okeechobee; Lower St. Johns; Manatee; Myakka; Oklawaha; Peace; Tampa Bay; Upper St. Johns; Vero Beach; Western Okeechobee Inflow; Withlacoochee

Table last updated 6/15/2024

† Populations may not be currently present.

Means of Introduction: Uncertain, but possibly introduced as a forage grass (Cook et al. 2005).  

References: (click for full references)

Diaz, R., W.A. Overholt, and J.P. Cuda. 2003. Wetland Weeds: West Indian Marsh Grass (Hymenachne amplexicaulis). Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. Publication date: December 2003. Revised: February 2008 (accessed 18 April 2008).

Cook, B.G., Pengelly, B.C., Brown, S.D., Donnelly, J.L., Eagles, D.A., Franco, M.A., Hanson, J., Mullen, B.F., Partridge, I.J., Peters, M. and Schultze-Kraft, R. 2005. Tropical Forages: an interactive selection tool., CSIRO, DPI&F(Qld), CIAT and ILRI, Brisbane, Australia (accessed 18 April 2008).

Author: Howard, V.

Revision Date: 4/18/2008

Citation Information:
Howard, V., 2024, Hymenachne amplexicaulis (Rudge) Nees: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?SpeciesID=1121, Revision Date: 4/18/2008, Access Date: 6/15/2024

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. [2024]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [6/15/2024].

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