Rhynchospora oligantha A.Gray
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Densely cespitose perennial 1.5–4 dm; stems very slender, triquetrous, lfless or 1-lvd near the base; lvs setaceous, about equaling the stem; infl of (1)2–5 spikelets on 1–2(3) short branches, subtended by an erect bract resembling a continuation of the stem, one branch diverging at a right angle, the other 1 or 2 erect or arcuate; spikelets light brown, 4–7 mm, with 2–4 fls and 1–3 frs; bristles 6, a little shorter to a little longer than the achene, strongly plumose toward the base; achenes brown, plump, elliptic to obovate, 2–2.7 mm, constricted just below the top, transversely rugulose; tubercle conic, 0.3–0.6 mm. Pine-barren bogs; N.J. to Fla., Tex., W.I., and C. Amer.