|Photo by © Arthur Haines, New England Wild Flower Society|
|Division:||Magnoliophyta - Flowering plants|
|Class:||Liliopsida - Moncots|
| Eleocharis melanocarpa|
|Natural range of Eleocharis melanocarpa from USDA NRCS Plants Database.|
E. melanocarpa is a perennial, monoecious, graminoid, sedge. On its seed, the tubercle is very short and dilated with its projecting edge rolled over and surrounding the top of the nut. The tips of the culms of E. melanocarpa often arch over and root in the substrate forming a dense tangle.  It commonly grows in stools containing several roots and five to 20 stems. Stems range in length from 1 to 3.6 ft (0.3 to 1.1 m) in length. Stools are commonly bunched together into clusters 1 ft (0.3 m) or more in diameter.
E. melanocarpa ranges from Massachusetts to Florida and Mississippi, disjunct to eastern Texas, southern Michigan, and northern Indiana.  Despite most studies not listing E. melanocarpa as occurring in Louisiana, the species has been found in parts of Bienville Parish in 2008 suggesting a more connective distribution along its southern range.
E. melanocarpa is a facultative wetland species found in moist to wet ditches and freshwater pond margins, wet pine savannas, and coastal plain bogs. Such occurrences in these habitats are often ephemeral, sandy, and can range from sunny to shady.
Despite typically inhabiting wet areas, fires from adjacent habitats (e.g. longleaf pine savannas, sandhill pines, old-field, etc.) are thought to burn into drawn-down areas of wet ponds/ditches. Such burns likely maintain more open canopy conditions benefiting populations of E. melanocarpa. 
E. melanocarpa has no organs for attracting insects for pollination. Instead, it relies on the wind to disseminate pollen.
Conservation and Management
Cultivation and restoration
References and notes
- Weakley A. S.(2015). Flora of the Southern and Mid-Atlantic States. Chapel Hill, NC: University of North Carolina Herbarium.
- USDA, NRCS. (2016). The PLANTS Database (http://plants.usda.gov, 30 November 2017). National Plant Data Team, Greensboro, NC 27401-4901 USA.
- Hill E. J. (1894). Eleocharis melanocarpa a proliferous plant. Bulletin of the Torrey Botanical Club. 25(7):392-394.
- Sorrie B. A. and Leonard S. W. (1999). Noteworthy records of Mississippi vascular plants. Sida 18:889-908.
- Reid C. S. and Faulkner P. L. (2010). Louisiana. Castanea 75(1):138-140.
- Sorrie B. A. and Weakley A. S. (2001). Coastal plain vascular plant endemics: Phytogeographic patterns. Castanea 66(1/2):50-82.
- Contributions to the flora of Florida: 8, Eleocharis (Cyperaceae). Castanea 40(1):16-36.
- Harper R. M. (1918). The vegetation of the Hempstead Plains. Proceedings of the semi-centennial anniversary of the Torry Botanical Club. Memoirs of the Torrey Botanical Club 17:262-286.