Carex eburnea Boott

Densely tufted and with long, slender rhizomes; stems very slender, 1–3 dm; lvs shorter than the stems, involute, 0.5 mm wide or less; spikes subtended by short bladeless sheaths, the pistillate 2 or 3, 3–6 mm, 2–6-fld, on long erect peduncles overtopping the terminal linear staminate spike; pistillate scales broadly ovate, much shorter than the perigynia, whitish with narrow green midvein, obtuse or acutish; perigynium-body light green, some becoming brown, 1.5–2 mm, obovoid, trigonous, ribbed on the lateral angles, finely few-nerved, glabrous, filled by the trigonous achene, abruptly narrowed to a conic beak 0.2 mm. Calcareous soil; Nf. to Mack. and B.C., s. to Va., Ala., Nebr., and Tex.