Carex geyerii Boott

Loosely cespitose, the aphyllopodic stems 1.5–5 dm tall from short rhizomes; lvs elongate, flat, 1.5–3 mm wide; spike 1, the terminal staminate part slender, 1–2.5 cm; pistillate scales oblong-obovate, longer and wider than the perigynia, acute or the lower short-cuspidate, with hyaline margins; perigynia 1–3, ellipsoid or obovoid, obscurely trigonous, 5–6 mm, 2-ribbed, otherwise nerveless, tapering to a spongy base, rather abruptly contracted above to the scarcely beaked tip; achene trigonous, 4–5 mm, filling with perigynium; rachilla to half as long as the achene, or obsolete. Dry woods in calcareous soil; Centre Co., Pa.; Alta. to Colo., w. to B.C. and Calif.