''Sesuvium trianthemoides'', called Texas sea-purslane, is a rare

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found els ...

plant known only from

Kenedy County Kenedy County is a county located in the U.S. state of Texas. As of the 2020 census, its population was 350. It is the third-least populous county in Texas and fourth-least populous in the United States. Its county seat is Sarita. The count ...

in southern

Texas Texas (, ; Spanish language, Spanish: ''Texas'', ''Tejas'') is a state in the South Central United States, South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2 ...

. It grows in salt marshes along the seacoast. The species is closely related to the more widespread ''S. maritimum'', referred to as annual or slender sea-purslane. This is common in coastal environments from

New York State New York, officially the State of New York, is a U.S. state, state in the Northeastern United States. It is often called New York State to distinguish it from its largest city, New York City. With a total area of , New York is the List of U.S. ...

as well as in the

West Indies The West Indies is a subregion of North America, surrounded by the North Atlantic Ocean and the Caribbean Sea that includes 13 independent island countries and 18 dependencies and other territories in three major archipelagos: the Great ...

. The two can be distinguished by smooth seeds about 1.0 mm across in ''S. maritimum'', rough-surfaced seeds approximately 1.5 mm in diameter in ''S. trianthemoides''. Both are small succulent herbs that form large clonal colonies by means of rhizomes.Correll, D. S. & M. C. Johnston. 1970. Manual of the Vascular Plants of Texas i–xv, 1–1881. The University of Texas at Dallas, Richardson.

References

{{Taxonbar, from=Q16758661 Endemic flora of Texas trianthemoides Plants described in 1966 Flora without expected TNC conservation status