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Rhizome slender (1-2 1/2 mm diam.), elongate, white or greenish-white, covered with membranous, striate scales. Culms 5-30 mm apart, slender, 7-32 mm tall, triangular, glabrous, bases unthickened. Leaves few, equalling or shorter than culms; sheaths membranous, lower 1-2 leafless or briefly laminate; blades 1-3 mm wide, margins and keel scabrid, shortly acuminate. Bracts 3-4, long, erect, later spreading. Inflorescence of 1 spike (rarely 2 or 3), ovoid to ellipsoid, greenish-white, dense. Spikelets numerous, tightly packed, elliptic in outline, 2-3.5 mm long; floret 1, bisexual, rarely 2, lower bisexual, upper male. Fertile glumes 2, membranous, transparent white, lower 7-nerved, upper 3-5-nerved, keel green, scabrid, excurrent into acute recurved mucro (0.2-0.45 mm). Stamens 1 per floret. Style short, far exceeded in length by style branches. Nut 1/2 length of glume; broadly obovate, yellow.
Plants perennial, cespitose or not, long-creeping rhizomatous. Culms sometimes spaced to 3 cm apart, (5–)12–25(–55) cm, smooth. Leaves flat, 2–21 cm × 1.5–3.5 mm. Inflorescences: spikes 1–3, 4–7 × 4 mm; bracts 3–4, longest ± erect, others ascending to horizontal, flat, 1.5–18 cm × 1–3.3 mm. Spikelets (20–)40–60(–100), pale greenish or reddish brown, ovate, (2.2–)2.5–2.8(–3.2) × (0.6–)0.7–0.8(–1.2) mm; floral scales laterally 2–3-veined, elliptic to ovate, 1.8–3 × (0.8–)1.1–1.6 mm, midvein not winged, apex mucronate; stamens (1–)2; anthers 0.8–1.1 mm; style 0.6–1.2 mm; stigmas 0.5–1.5 mm. Achenes brown, substipitate or stipitate, ellipsoid to oblong-ellipsoid, 1–1.2(–1.3) × 0.6–0.8 mm, stipe, if present, 0.1–0.2 mm, apex obtuse to subtruncate, apiculate, papillate.
Similar to K. erecta in the inflorescence but having an elongated slender rhizome
Perennial with rhizomes often elongate; otherwise as in K. pumila,
