Eleocharis tuberculosa is a perennial herb forming dense clumps.
Culms are elliptical in cross-section, up to 70 cm tall.
Styles of
pistillate flowers have a swollen base called a
tubercule, white to pale orange-brown, often with red spots, up to 2.5 mm across.[3][6][7][8][9][10]
^Gleason, H. A. & A.J. Cronquist. 1968. The Pteridophytoa, Gymnospermae and Monocotyledoneae. 1: 1–482. In H. A. Gleason New Britton and Brown Illustrated Flora of the Northeastern United States and Adjacent Canada (ed. 3). New York Botanical Garden, New York.
^House, Homer Doliver. 1920. American Midland Naturalist 6: 205.
^Godfrey, R. K. & J. W. Wooten. 1979. Aquatic and Wetland Plants of Southeastern United States Monocotyledons 1–712. The University of Georgia Press, Athens.
^Wunderlin, R. P. 1998. Guide to the Vascular Plants of Florida i–x, 1–806. University Press of Florida, Gainesville.
^Fernald, M. 1950. Gray's Manual of Botany (ed. 8) i–lxiv, 1–1632. American Book Co., New York.