Flora of North America species comparison

(35–)40–110 cm;

vegetative culms few, inconspicuous, with 6–8 leaves, not strikingly 3-ranked.

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

sheaths adaxially white-hyaline, summits concave or truncate, prolonged beyond collar to 2.5 mm, papillose at least near apex;

distal ligules 1–5 mm;

blades 3–4 per fertile culm, 2.5–25 cm × 2–5 mm, usually adaxially papillose.

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.

open, pale brown, 0.24–0.62 cm × 8–15 mm;

proximal internode 5–17 mm; 2d internode 3–10 mm;

proximal bracts scalelike, with bristle tips shorter than inflorescences.

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.

3–6(–8), distant, distinct, ovoid to clavate, 7–21 × 5.5–12 mm, base rounded to long tapered, apex rounded.

15–80 in larger spikes, ascending or ascending-spreading, green to pale whitish green with reddish brown margin, conspicuously 8–12-veined abaxially, 4–8-veined adaxially, broadly elliptic to nearly orbiculate, (4.5–)5.1–6.7(–7.1) × (2.4–)2.8–4.2 mm, 0.5–0.7 mm thick, membranaceous with brown achene visible through hyaline adaxial face, margin flat, including wing 0.8–1.2 mm wide, often erose, scalloped, or with an irregular tooth, smooth;

beak pale brown at tip, flat, ciliate-serrulate, abaxial suture inconspicuous, distance from beak tip to achene 2.4–3.7 mm.

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.

elliptic to oblong, 1.6–2.2 × 1.1–1.6 mm, 0.5 mm thick.

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

scales reddish brown with green midstripe, lance-ovate to ovate, 3.1–5.4 mm, 1.9–3.2 times as long as wide, (1–)1.4–2.3 mm shorter than perigynia, narrower than perignyia, apex obtuse to acute.

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

(2.4–)2.8–4.2 mm.

1.1–1.4 mm.

scales obtuse.

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

0.8–1.4 mm.

= 76, 78.

= 56.