Flora of North America species comparison

present.

absent.

terete, without spots, to 100 cm;

nodal 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.

petioles 3.5–26 cm;

blade adaxially light green, lenticular to elliptic, 3–11 cm × 15–45 mm, base cuneate to rounded, apex acute to rounded;

veins 9–21.

petiolate, lax;

stipules persistent to deliquescent, conspicuous, convolute, free from blade, light brown, not ligulate, 3–9 cm, not fibrous, not shredding at tip, apex round to acute;

petioles 2–13 cm;

blade light to dark green, linear-lanceolate to lance-elliptic, not arcuate, 9–20 cm × 10–35 mm, base acute, without basal lobes, not clasping, margins entire, not crispate, apex not hoodlike, acute, without sharp awl-like tip, lacunae in 2–5 rows each side of midrib;

veins 7–15.

unbranched, emersed;

peduncles not dimorphic, terminal, erect to ascending, cylindric, 3–15 cm;

spikes not dimorphic, cylindric, 20–70 mm.

unbranched, emersed;

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

spikes not dimorphic, cylindric, 15–30 mm.

sessile, red to reddish brown, obovoid, abaxially keeled, laterally ridged, 2.7–4.3 × 2.5–3 mm, keel well developed, lateral ridges with blunt to sharp tips;

beak erect;

sides without basal tubercles;

embryo with 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.

= 52.