Flora of North America species comparison

present.

absent.

terete, without spots, to 250 cm;

nodal glands absent.

terete, without spots, 2–5 cm;

glands absent.

absent.

common, axillary, 0.5–2 cm × 0.5–1.2 mm, soft;

leaves ± 2-ranked;

outer leaves 2–3 per side, base not corrugate, apex acute;

inner leaves undifferentiated or rolled into tight, hardened structure.

submersed, ± spirally arranged, sessile, lax;

stipules deteriorating into fibers and deciduous, inconspicuous (absent on proximal portion of stem), convolute, free from blade, light brown to green, not ligulate, 3.5–6.5 cm, not fibrous, not shredding at apex;

blade olive-green, broadly lanceolate, orbiculate, or ovate, not arcuate, 0.9–7.6(–9.7) cm × 7–40 mm, base rounded, without basal lobes, clasping, margins entire, often crispate, apex not hoodlike, not splitting when pressed, round, rarely acute;

veins 3–25.

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

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

blade adaxially greenish brown, elliptic, spatulate, or obovate, 0.6–1.5 cm × 3–8 mm, base acute, apex obtuse;

veins 5–9.

sessile, delicate;

stipules persistent, inconspicuous, convolute, free from blade, green to brown, not ligulate, 0.4–1.2 cm, not fibrous, not shredding at tip, apex attenuate;

blade light green, linear-filiform, not arcuate, 2–8 cm × 0.1–1 mm, bases slightly tapering, without basal lobes, not clasping, margins entire, not crispate, apex not hoodlike, acute to almost bristle-tipped, lacunae present, rarely absent, 0–2 rows each side of midvein;

veins 1(–3).

unbranched, emersed;

peduncles not dimorphic, terminal or axillary, erect to rarely recurved, cylindric, 1–7.3 cm;

spike not dimorphic, cylindric, 0.4–4.8 cm.

unbranched, emersed;

peduncles not dimorphic, terminal, ascending in flower, recurved in fruit, cylindric, 5–30 mm;

spikes not dimorphic, cylindric or moniliform, 6–8 mm.

sessile, greenish brown to olive-green, obovoid, turgid or rarely concave, not abaxially or laterally keeled, 1.6–3 × 1.3–2.2 mm;

beak erect, 0.4–0.6 mm;

sides without basal tubercles;

embryo with 1 full spiral.

sessile, green to brown, obliquely round-obovoid, compressed, abaxially keeled, not laterally keeled, 1.5–2.5 × 1.2–1.6 mm;

beak erect, 0.3–0.5 mm;

sides without basal tubercles;

embryo with 1 full spiral.

= 52.

= 28.