Flora of North America species comparison

absent.

present.

terete, without spots, 27–95 cm;

glands white, green, greenish brown, or gold, to 0.3 mm diam.

terete, without spots, 28–120 cm;

nodal glands absent.

terminal or lateral, common, 2.5–4.8 cm × 0.8–2.2 mm, soft;

leaves ± 2-ranked, flattened with outer and inner leaves in same plane;

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

inner leaves undifferentiated.

absent.

submersed, ± spirally arranged, rigid, sessile;

stipules disintegrating, inconspicuous, connate, free from blade, white, not ligulate, 0.6–1.6 cm, fibrous, shredding at tip, apex obtuse;

blade green to olive-green, linear, not arcuate, 1.2–6.3 cm × 0.6–2 mm, base slightly tapering, without basal lobes, not clasping, margins entire, not crispate, apex not hoodlike, acute to nearly bristle-tipped, rarely obtuse to apiculate, lacunae absent;

veins 3–5(–7).

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

petioles continuous in color to apex, 2–9 cm;

blade adaxially light green, elliptic to oblong-elliptic, 4–19 cm × 20–65 mm, base cuneate, apex round-mucronate;

veins 13–29.

sessile or petiolate, lax;

stipules persistent, conspicuous, convolute, free from blade, light brown to red-brown, not ligulate, 1–8 cm, not fibrous, not shredding at tip, apex acuminate;

petioles if present 0.5–4 cm;

blade red-brown to light green, elliptic to lanceolate or rarely linear, often arcuate, 5–20 cm × 2–45 mm, base acute, margins entire, often crispate, apex not hoodlike, acute-mucronate, lacunae in 2–5 rows each side midrib;

veins 7–19.

unbranched, emersed;

peduncles not dimorphic, terminal, erect, rarely recurved, cylindric, rarely slightly clavate, 1–4.5 cm;

spike not dimorphic, cylindric, 0.6–1.3 cm.

emersed, unbranched;

peduncles not dimorphic, terminal or axillary, erect to ascending, cylindric, 4–30 cm;

spikes not dimorphic, cylindric, 25–70 mm.

sessile, green-brown, ovoid, turgid, not abaxially or laterally keeled, 1.9–2.1 × 1.3–1.8 mm;

beak erect, 0.5–0.8 mm;

sides without basal tubercles;

embryo with 1 full spiral.

sessile, grayish green to olive green, obovoid to ovoid, laterally compressed, abaxially keeled, laterally ridged, 2.5–3.6 × 2.1–3 mm, abaxial keel well developed, lateral ridges without points;

beak erect to slightly recurved, 0.5–0.8 mm;

sides without basal tubercles;

embryo with 1 full spiral.

= 26.

= 104.