Eriocaulon aquaticum (Hill) Druce
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Lvs very thin, often pellucid, 2–10 cm × 2–5 mm, 3–9- nerved with conspicuous cross-veinlets, tapering evenly from a pale, spongy-aerenchymatous base; scapes usually solitary for each rosette, 3–20 cm (or much longer in deep water), slender, slightly twisted, 5–7- ridged; mature heads subglobose, 4–6 mm thick, gray except for the exserted white-hairy tips of the tep and receptacular bracts; invol bracts ovate to obovate, obtuse, lustrous dark gray, glabrous, reflexed and concealed at maturity; receptacle glabrous; 2n=32. Usually in shallow water, occasionally in deeper water or on miry shores; Nf. to Minn., s. to Del. and Ind., and in the mts. to N.C.; also in Ireland and Scotland, where 2n=64. July–Sept. (E. articulatum; E. pellucidum; E. septangulare)