Flora of North America species comparison

compressed-filiform, without spots, to 50 cm;

glands green, golden brown to dark brown, 0.2–0.6 mm diam.

terete, without spots, 5–30 cm;

nodal glands absent.

terminal or lateral, uncommon, 3.7–9.9 × 2.6–6 cm, soft to hard;

leaves flattened with outer and inner leaves in same plane;

outer leaves 1–2 per side, base not corrugate, apex apiculate;

inner leaves undifferentiated or rolled into hardened, fusiform structure.

absent.

submersed, ± spirally arranged, sessile, rigid;

stipules persistent, inconspicuous, convolute, free from blade, brown or rarely white, not ligulate, 0.9–2.1 cm, slightly fibrous, partially shredding at tip, apex obtuse;

blade somewhat reddish to olive-green, linear, not arcuate, 1.5–10 cm × 1.2–2.9 mm, base slightly tapering, without basal lobes, not clasping, margins entire, not crispate, apex not hoodlike, cuspidate to bristle-tipped, lacunae present or absent, in 0–3 rows each side of midvein;

veins 3–9(–13).

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

petioles continuous in color to apex, 1–17 cm;

blade adaxially reddish brown, ovate, 3–8(–10) cm × 10–46 mm, base rounded or slightly cordate, apex obtuse, acute, or somewhat apiculate;

veins (11–)15–19(–21).

petiolate, lax;

stipules persistent, conspicuous, convolute, free from blade, greenish, not ligulate, to 3 cm, not fibrous, not shredding at tip, apex acute;

petioles 1–3(–8) cm;

blade dark green, lanceolate to occasionally ovate, occasionally arcuate, 3–13 cm × 4–15(–44) mm, base acute, without basal lobes, not clasping, margins entire, not crispate, apex not hoodlike, acute, lacunae in 2–4 rows each side of midvein;

veins 7–11.

unbranched, emersed;

peduncles not dimorphic, terminal or occasionally axillary, erect or rarely recurved, slightly clavate, 1–3 cm;

spikes not dimorphic, cylindric, 5–11 mm.

unbranched, emersed;

peduncles not dimorphic, erect to slightly recurved, cylindric, 4–12 cm;

spikes not dimorphic, cylindric, 20–40 mm.

sessile, dark green, orbicular, turgid, abaxial keel obscure, lateral keels obscure or absent, 2.5–3 × 2.2–3 mm, lateral keels if present without points;

beak erect, 0.5 mm;

sides without basal tubercles;

embryo with 1 full spiral.

sessile, dark reddish brown, obovoid to orbicularoid, compressed, not abaxially or laterally keeled, (1.6–)2–2.5 × (1.2–)1.5–2.1 mm;

beak minute or obsolete, recurved;

sides without basal tubercles;

embryo with 1 full spiral.

unknownnot available.

absent.

present.

= 26.