Eleocharis equisetoides

Eleocharis equisetoides, with common names including horsetail spike-rush, jointed spike-rush, spikesedge, and knotted spike-rush, is a plant species native to the United States and Ontario, usually in freshwater wetland areas. It is known primarily from the Atlantic coastal plain from Texas to Massachusetts, and the Great Lakes region, with scattered populations elsewhere.^[3][4][5]

Eleocharis equisetoides
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Monocots
Clade:	Commelinids
Order:	Poales
Family:	Cyperaceae
Genus:	Eleocharis
Species:	E. equisetoides
Binomial name
Eleocharis equisetoides (Elliott) Torr.
Synonyms[1][2]
Eleocharis elliottii A.Dietr. Limnochloa equisetoides (Elliott) Walp. Scirpus equisetoides Elliott

Eleocharis equisetoides and the related E. interstincta have hollow stems with complete transverse septa. This gives them a jointed appearance superficially resembling the stems of some species of Equisetum. The two species can be distinguished by the length of the perianth bristles subtending the achenes.^[3][6][7]