Eleocharis parvula (Roem. & Schult.) Link
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Diminutive, very slender perennial from inconspicuous slender rhizomes, forming dense mats; stems filiform, 2–6(–10) cm; spikelet ovoid, 2.5–4(–6) mm, with 2–9(–20) fls; scales ovate, obtuse or acute, green to stramineous or brown, 1.5–2(–2.5) mm, the lowest one empty; style trifid; achene stramineous, ± trigonous, 0.9–1.3 mm including the short (0.15–0.3 mm), thickened, confluent tubercle; 2n=8, 10. Wet, saline or alkaline sites; irregularly cosmop. The var. parvula, with bristles equaling or surpassing the smooth achene, occurs in salt-marshes on both coasts of N. Amer. and at scattered inland stations chiefly e. of the Mississippi R., as well as in the Old World. The var. anachaeta (Torr.) Svenson, with the bristles ± reduced or obsolete, and often with cellular-roughened achenes, occurs at scattered inland stations w. of the Mississippi, s. to Mex. and the Caribbean. (E. coloradoensis)