Flora of North America species comparison

terete, without spots, to 200 cm;

nodal glands absent.

compressed, without spots, 5–40 cm;

glands absent.

absent.

absent.

submersed and floating or floating absent, ± spirally arranged.

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

petioles continuous in color to apex, 0.1–1.2 cm;

blade reddish green, elliptic or oblanceolate to obovate or oblong-linear, 4–7(–10) cm × 10–25(–40) mm, base gradually tapering into petiole, apex obtuse or acute;

veins (7–)9–13(–15).

petiolate;

petioles continuous in color to apex, 5–25 mm;

blade adaxially light green, oblong to obovate, 0.7–—3.5 cm × 2–13 mm, base tapered to rounded, apex obtuse, rounded;

veins 5–15.

sessile, lax;

stipules persistent, inconspicuous, convolute, free from blade, light brown to reddish, not ligulate, (1.2–)1.5–2.5(–4) cm, not fibrous, not shredding at tip, apex blunt;

blade reddish green, oblong-linear to linear-lanceolate, not arcuate, 4.5–18(–25) cm × 5–20 mm, base rounded, without basal lobes, slightly clasping, margins entire, not crispate, apex not hoodlike, obtuse or acute, lacunae in 0–6 rows each side of midvein;

veins 7–9.

sessile, lax;

stipules persistent to deliquescent, inconspicuous, convolute, adnate to blade for ½ stipule length, reddish brown to light green, ligulate, 2–12 mm, not fibrous, not shredding at tip, apex obtuse;

blade red-brown to light green, linear, not arcuate, 0.8–8 cm × 0.5–2 mm, base slightly tapering, without basal lobes, not clasping, margins entire, not crispate, apex not hoodlike, obtuse to acute, lacunae present, a broad band each side of midvein;

veins 1–3.

unbranched, emersed;

peduncles not dimorphic, terminal or axillary, erect, cylindric, 3–10(–16) cm;

spikes not dimorphic, cylindric, 10–35 mm.

unbranched;

peduncles dimorphic, submersed axillary, recurved, clavate, 0.5–3 mm, emersed axillary or terminal, erect to recurved, slightly clavate, 4–27 mm;

spikes dimorphic, submersed capitate, 2–5 mm, emersed ellipsoid to cylindric, 4–13 mm.

pedicellate, tawny olive-green, obovoid, plump, turgid, abaxially keeled, laterally keeled or not, (2.5–)3–3.5 × (1.7–)2–2.4 mm, lateral keels when present without points;

beak abaxially curved, 0.5–0.9 mm;

sides without basal tubercles;

embryo with 1 full spiral.

sessile, greenish brown, somewhat orbicular, compressed, abaxially winged, laterally winged, 4–13 × 1.3–2.4 mm, lateral wing with blunt tips;

beak absent;

sides without basal tubercles;

embryo with more than 1 full spiral.

present.

present.

= 52.