Monographs Details: Eleocharis acicularis (L.) Roem. & Schult.
Authority: Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Description:Species Description - Diminutive, very slender perennial, commonly forming dense tufts on slender rhizomes; stems 3–12 cm, filiform, up to 0.25 mm thick; spikelet 2.5–7(–9) mm, 3–15- fld; scales (1.3–)1.5–2.2 mm, with a greenish midrib and ± hyaline, paler or partly anthocyanic margins, the basal one floriferous; bristles mostly 3 or 4, equaling or surpassing the achene, or reduced or obsolete; anthers 0.7–1.3 mm (dry); style trifid; achene white to pale gray or faintly yellowish, 0.7–1 mm, rounded-trigonous, longitudinally 8–18-ribbed and with very numerous fine, straight cross-ridges; tubercle short, ± triangular-conic; 2n=20–58. Marshes, muddy shores, and other wet places; circumboreal, s. to Fla. and Mex.