Flora of North America species comparison

14–66 cm × 0.4–1 mm, smooth or scabriduous.

50–110 cm;

vegetative culms with numerous leaves spaced evenly along distal 1/2.

ligules 2.7–6.9 mm, 2.5–6 times as long as wide;

blades 0.9–2.3 mm wide, widest blade 1.3–2(–2.3) mm wide.

sheaths adaxially green-veined nearly to collar, with ± triangular white-hyaline area to 3–8 mm proximal to collar, somewhat loose, expanded near summits, ± wing-angled, adaxially firm, summits U-shaped, somewhat thickened, slightly prolonged beyond collar;

distal ligules 4–8(–12) mm;

blades 4–10 per fertile culm, 15–40 cm × (2–)3–7 mm.

16–58(–87) mm;

proximal internode 5.7–32(–46) mm;

proximal bracts 3.8–18(–34) mm, awn 0.4–15(–31) mm;

spikes 4–6(–7), usually gynecandrous, sometimes pistillate;

lateral spikes with 0–5 staminate and 8–18 pistillate flowers, longest proximal spike 5.5–9.8 × 4–5.6 mm;

terminal spikes usually with 2–9 staminate and 4–18 pistillate flowers, 6.2–13 × 2.9–6.8 mm.

erect, dense distally, brown, 2–5(–8) cm × 10–20 mm;

proximal internode 2–20 mm; 2d internode 2–13 mm;

proximal bracts bristlelike, 1(–8) cm.

6–15, overlapping or distinct, ovoid-oblong to globose, 6–12(–16) × 4–8 mm, base rounded to tapered, apex rounded.

ascending to spreading or occasionally recurved, green to brown and often ferruginous tinged apically, prominently to weakly 3–8-veined adaxially, 7–14-veined abaxially, ovate to narrowly ovate, 2.3–3.7 × 1.1–1.5 mm, 1.8–2.5(–3) times as long as wide, apex abruptly contracted or gradually tapering;

beak 0.4–1.1(–1.3) mm, 0.15–0.33(–0.38) times as long as perigynia, margins sparsely serrulate or entire, apex entire or bidentulate with teeth to 0.1 mm, teeth 0–0.03 times as long as perigyina.

more than (30–)40 per spike, appressed-ascending to ascending, pale green to pale brown, 3–6-veined abaxially, conspicuously or, occasionally, faintly, 2–4-veined adaxially, often somewhat asymmetric, ovate-lanceolate to ovate-elliptic, plano-convex, 3–5.4 × 1.1–1.7 mm, 0.3–0.5 mm thick, margin flat, including wing 0.1–0.5 mm wide;

beak tip flat, ciliate-serrulate, abaxial suture with golden to dark brown hyaline margin, distance from beak tip to achene 1.4–2 mm.

1.3–2 × 0.9–1.2 mm, 1.4–1.7 times as long as wide.

oblong-ovate, 1–1.8 × 0.6–0.9 mm, 0.3–0.5 mm thick.

scales with margins ferruginous to castaneous or occasionally stramineous, 2–2.7 × 1.4–1.7 mm, apex acute.

scales white-hyaline or pale silvery brown with green midstripe, lanceolate, (1.9–)2.5–3 mm, 1/2 length of and narrower than perigynia, apex acute to acuminate.

scales with margins ferruginous to castaneous or occasionally stramineous, 2.5–3.6 × 1.5–1.8 mm, apex acute.

1.1–1.4 mm.

0.8–1.4 mm.

= 56.

= 70.