Flora of North America species comparison

present.

absent.

terete, without spots, 10–35 cm;

glands absent.

conspicuously flattened ("wing-flattened"), without spots, 60–120 cm;

glands absent or rarely present, when present, gold, 0.3 mm diam.

absent.

common, terminal or lateral, 4–7.5 × 2–4.5 cm, firm;

leaves ± 2-ranked;

outer leaves 3–4 per side, base not corrugate, apex acute;

inner leaves undifferentiated.

both submersed and floating or floating absent, ± spirally arranged.

submersed, ± spirally arranged, sessile, rigid;

stipules persistent, conspicuous, convolute, free from blade, white, not ligulate, 1.5–3.5 cm, fibrous, shredding at tip, apex obtuse to acuminate;

blade light green, linear, not arcuate, 10–20 cm × 2–5 mm, base rounded, without basal lobes, not clasping, margins entire, not crispate, apex not hoodlike, blunt, acuminate, or bristle-tipped, lacunae absent;

veins 15–35.

petiolate;

petioles continuous in color to apex, 2.5–6 cm;

blade greenish brown adaxially, lance-oblong, 2–4(–5.5) cm × 5–13 mm, base acute, apex acute;

veins 9–23.

sessile, lax;

stipules persistent, inconspicuous, convolute, adnate to blade for ¼ or less stipule length, light brown to dark green, ligulate, 0.5–1.5 cm, not fibrous, not shredding at tip, apex acute;

blade red-brown to dark green, linear-filiform, not arcuate, 2.5–10.5 cm × 0.2–1(–2) mm, base slightly tapering, not clasping, without basal lobes, margins entire, not crispate, apex not hoodlike, long tapering, lacunae abundant, broad, filling area between margin and midvein;

veins 1–3.

unbranched, emersed;

peduncle not dimorphic, axillary, ascending, cylindric, 3–8 cm;

spikes not dimorphic, cylindric, 10–22 mm.

unbranched, emersed;

peduncles not dimorphic, terminal, erect to ascending, occasionally recurved, cylindric, 2–5 cm;

spikes not dimorphic, cylindric, 15–30 mm.

sessile, greenish brown, quadrate-orbicular, slightly compressed, abaxially keeled, laterally ridged, 2.5–3 × 2–2.5 mm;

lateral ridges without points;

beak present, erect, 0.5 mm;

sides without basal tubercles;

embryo with less than 1 full spiral.

light green to olive-green, quadrate-oblong or nearly orbicular, turgid, sessile, with abaxially keeled, not laterally keeled, 4–5 × 3–3.5 mm, keel winglike;

beak erect, 0.6–1 mm;

sides without basal tubercles;

embryo with 1 full spiral.

= 52.