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Plant Database

Search for native plants by scientific name, common name or family. If you are not sure what you are looking for, try the Combination Search or our Recommended Species lists.

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Eleocharis tuberculosa

Eleocharis tuberculosa (Michx.) Roem. & Schult.

Cone-cup Spikerush, Tubercled Spikerush, Long-tubercled Spikerush

Cyperaceae (Sedge Family)

Synonym(s): Eleocharis simplex, Eleocharis tuberculosa var. pubnicoensis, Scirpus tuberculosa


USDA Native Status: L48 (N), CAN (N)

Found from Nova Scotia south to Florida and west to Arkansas and southeast Texas, Eleocharis tuberculosa is uncommon in the northern reaches of its range, classified as threatened by Canada's Species at Risk Act, endangered in Maine and New Hampshire, and threatened in New York. It is now extinct in Pennsylvania.


From the Image Gallery

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Plant Characteristics

Duration: Perennial
Habit: Grass/Grass-like
Root Type: Fibrous
Leaf Arrangement: Alternate
Leaf Complexity: Simple
Leaf Venation: Parallel
Inflorescence: Spikelet
Fruit Type: Achene
Size Notes: Up to about 30 inches tall.

Bloom Information

Bloom Color: White , Green , Brown
Bloom Time: Apr , May , Jun , Jul , Aug , Sep , Oct , Nov
Bloom Notes: Perianth absent. Bloom time denotes fruiting period for Eleocharis spp.


USA: AL , AR , CT , DC , DE , FL , GA , LA , MA , MD , ME , MS , NC , NH , NJ , NY , PA , RI , SC , TN , TX , VA
Canada: NS
Native Habitat: Fresh Water Aquatic

National Wetland Indicator Status

This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1 (Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here for map of regions.

Wildflower Center Seed Bank

LBJWC-1278 Collected 2009-06-13 in Montgomery County by Lady Bird Johnson Wildflower Center

1 collection(s) available in the Wildflower Center Seed Bank

Web Reference

Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter

Additional resources

USDA: Find Eleocharis tuberculosa in USDA Plants
FNA: Find Eleocharis tuberculosa in the Flora of North America (if available)
Google: Search Google for Eleocharis tuberculosa


Record Modified: 2023-02-08
Research By: TWC Staff

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