Flora of North America species comparison

30–120(–140) cm;

vegetative culms with few leaves clustered at apex.

erect, 35–140 cm;

vegetative culms few, inconspicuous, usually fewer than 12 leaves, not strikingly 3-ranked, leaves clustered at apex.

sheaths adaxially conspicuously green-veined nearly to collar, with a narrow hyaline band or sharp Y-shaped hyaline region at collar; adaxially firm, summits U-shaped, finely papillose;

distal ligules 1.8–4.4(–6) mm;

blades 2–4(–6) per fertile culm, 8–30 cm × 2–4.5 mm.

sheaths usually with white intervenal areas abaxially, conspicuously green-veined adaxially nearly to collar, Y-shaped hyaline area at collar, adaxially firm, summits truncate and prolonged to 2 mm beyond collar, rounded, proximal sheath loose, smooth;

distal ligules 2–5.5 mm;

blades 3–7 per fertile culm, 20–65 cm × 2.2–6(–6.5) mm.

± erect, usually open, green to brown, 1–4.5(–6) cm × 5–14 mm;

proximal internode 1–14 mm; 2d internode 3–8 mm;

proximal bracts scalelike, often with bristle tips.

erect to arching, compact to open, green, 1.5–5 cm × 5–16 mm;

proximal internode 3.5–10(–11.5) mm; 2d internode 2–8 mm;

proximal bracts scalelike with bristle tips shorter than or equaling inflorescences.

3–10, distinct, ellipsoid to ovoid, 6–13(–17) × 3.8–7 mm, base rounded or obtuse, apex obtuse to broadly acute; staminate portion 2 mm or less.

4–10, overlapping to distinct, globose to ellipsoid, 7–13 × 4–7 mm, base rounded or occasionally tapered, apex obtuse to rounded.

appressed-ascending, green to drab brown, conspicuously 5–many-veined on each face, obovate, flat except over achene, 3–4.6 × 1.6–2.6(–2.8) mm, 0.4–0.5 mm thick, margin flat, including wing 0.5–0.8 mm wide;

beak green to brown at tip, flat, broadly triangular, ciliate-serrulate, abaxial suture with conspicuous white hyaline margin, distance from beak tip to achene 1.4–2.2 mm.

15–80 on larger spikes, spreading, green distally, conspicuously 4+-veined on each face, narrowly to broadly ovate, plano-convex, 2.7–4.1 × 1.3–2.3 mm, 0.35–0.5 mm thick, margin flat, including wing 0.25–0.45 mm wide, smooth;

beak pale green at tip, flat, ciliate-serrulate, abaxial suture with conspicuous white-hyaline margin, distance from beak tip to achene 1.2–2.2 mm.

oblong, 1.3–1.7 × 0.7–1 mm, 0.4–0.5 mm thick, apiculum less than 0.4 mm;

style straight.

elliptic, 1.3–1.6 × 0.9–1.2 mm, 0.35–0.5 mm thick.

scales white-hyaline, becoming pale silvery brown with age, with pale or green center, broadly lanceolate, 2.2–3.7 mm, shorter and narrower than perigynia, apex obtuse.

scales white-hyaline, with green midstripe, ovate, 2.1–3.3 mm, much shorter by 0.7–1.6 mm and narrower than perigynia, margins hyaline or pale, sometimes involute, apex obtuse to acute.

= 58, 62.

= 68.