Flora of North America species comparison

densely tufted, central or lateral, ascending or slightly decumbent, 45–62 cm × 0.5–1 mm.

50–110 cm;

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

basal sheaths tan or light brown;

sheaths green, sometimes glaucous, 4–88 mm;

blades green, sometimes glaucous, midrib and 2 lateral veins developed, flat or slightly corrugate, 30–46 cm × 3–14 mm, blades of overwintering leaves smooth or, rarely, sparsely papillose abaxially.

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.

0.6–14 cm × 0.8–6 mm, bract blades of distal lateral spikes linear, narrower than spikes, widest bract blade of distalmost lateral spike 0.5–3.4 mm wide.

peduncles of proximal spikes 0–5 cm, arising from proximal 1/3 of culms, 1.4–3.3(–5.3) times as long as spikes they subtend; of terminal spikes 0.4–12 cm.

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.

3(–4) per culm;

lateral spikes 22–62 × 3–5 mm;

distal lateral spikes separate;

terminal spike linear to linear-clavate, 22–32(–36) × 2–3 mm.

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

6–18 per spike, scattered to loosely overlapping, ratio of longer lateral spike length to perigynia number 1.9–3.4, ascending, finely, conspicuously (22–)25–32-veined, elongate, (3.4–)3.9–5.1 × 1.2–2 mm;

beak straight or slightly curved, 0.6–1.7 mm.

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.

elongate-obovoid, 2.2–2.8(–4.6) × 1–1.8 mm.

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

scales 3.4–5 × 1.2–2.2 mm, apex aristate, apiculate, or 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 oblong-ovate, 3–5 × 1.2–2 mm, margins hyaline or, occasionally, light brown, apex obtuse or acute.

3–3.2 mm.

= 36, 40.

= 70.