OregonFlora species comparison

terete; to 200 cm; nodal glands absent.

terete, 6–110 cm; nodal glands absent.

submersed and floating or submersed only.

submersed and floating or rarely submersed only.

elliptic or oblanceolate to obovate or oblonglinear, 40–70(100) × 10–25(40)mm; reddish green;

base gradually tapering to petiole;

tip obtuse or acute;

veins (7)9–13(15);

petioles 0–12 mm.

lanceolate to round elliptic, 43–92 × 25–38 mm, light green;

base rounded to cordate;

tip acute to rounded;

veins 27–49;

petioles 23–226 mm.

sessile, attached to stem nodes, not attached to stipules;

stipules (12)15–25(40)mm;

tip blunt;

blades oblong-linear to linear-lanceolate, 45–180(250) × 5–20 mm;

base rounded to cuneate;

margins entire;

tip obtuse or acute; lacunae in 0–6 rows on each side of midvein;

veins 7–9.

petiolate, attached to stem nodes, not attached to stipules;

stipules 15–117 mm;

tip acute;

blades ovate to oblanceolate, distinctly falcate, 50–125 × 15– 58 mm;

base rounded to acute;

margins entire and recurved; wavy;

tip acute to round-apiculate;

veins 19–49;

petioles terete, 0.9–11.5 cm.

emersed;

spikes cylindric, 10–35 mm;

peduncles terminal or axillary; erect, 30– 100(160)mm.

emersed;

spikes cylindric, 34–65 mm;

peduncles terminal or axillary; erect, cylindric, 45–223 mm.

pedicellate, obovoid; turgid; (2.5)3–3.5 × (1.7)2–2.4 mm, dorsally keeled, laterally keeled or not;

beaks dorsally curved, 0.5–0.9 mm.

sessile, obovoid; turgid, 5–6.7 × 4.5–5.2 mm; reddish brown, dorsally keeled, laterally ridged;

beaks erect, 0.5–0.8 mm.