Flora of North America species comparison

reddish brown to dark maroon at base; flowering stems 20–70 cm, much longer than leaves at maturity, 1–1.7 mm thick, glabrous or sparsely pilose.

straight, (40–)65–110(–125) cm, tallest culms 65–125 cm.

basal sheaths reddish brown, bladeless, pilose;

others grading from dark red to green on back, tan-hyaline on front, reddish brown dotted and usually pubescent at apex;

blades flat, 3–12 mm wide, usually pilose, more densely so abaxially, margins ciliate.

of flowering stems shorter than culms, to 28 cm × 1.8–3.8 mm;

ligules on distal cauline leaves truncate or rounded.

peduncles of lateral spikes, when present, less than 10 mm, often pubescent;

proximal bracts usually shorter than inflorescence;

sheaths 5–50 mm;

blades 1.2–2 mm wide.

peduncles of terminal staminate spikes (3–)10–60(–102) mm, 0.7–2.5 length of staminate spikes;

bracts 5–25 cm × 1.2–2.5 mm, 0.5–1.3(–1.9) times as long as inflorescences;

inner band of sheaths usually concave or truncate (occasionally convex).

proximal pistillate spikes 1–2(–3), distant, sessile or short-pedunculate, globose to ellipsoid or short-cylindric, 7–27 × 8–11 mm;

terminal staminate spikes pedunculate, (9–)17–39 × 1.4–2.5 mm.

pale green, blotched with dark maroon at base, dark maroon-brown distally, 2-ribbed and finely veined with to 20 veins, most conspicuous near base, loosely enveloping achene, ellipsoid, 3.7–5.3 × 1–2.2 mm, membranous, base acute, apex narrowing to beak, body covered with long, appressed to spreading hairs;

beak bidentate, 1 mm.

reflexed, yellow to yellowish green, (3.5–)3.9–5.2(–5.8) × 1.4–2.2 mm, apex abruptly narrowed;

beak forming angle greater than 20° with body, 1.4–2.2 mm, sparsely scabrous or, occasionally, smooth.

substipitate, 2–2.6 × 1.2–1.7 mm.

1.4–1.9 × 1.2–1.5 mm.

spikes 2–5, 1 per node, usually crowded toward apex and overlapping staminate spike, erect, sessile or pedunculate, pistillate with 20–40 perigynia attached less than 1 mm apart, cylindric, 12–40 × 4–11 mm.

spike staminate, rarely gynecandrous, sessile or very short-pedunculate, 8–30 × 2–5.5 mm.

scales reddish brown with narrow white-hyaline margins and green midrib, broadly ovate, shorter than mature perigynia, apex obtuse to short-cuspidate, often pubescent on midrib and awn, ciliate distally.

pistillate scales pale yellowish green, inconspicuous among perigynia, 2.1–3.3 × 0.9–1.3 mm; staminate scales reddish brown to pale brown, narrowly obovate to narrowly oblong, 2.9–5.6 × 1.2–1.9 mm, margins wide, pale hyaline, apex obtuse to acute.

2.1–3.6 mm.

= 50, 52.