OregonFlora species comparison

terete; to 200 cm; nodal glands absent.

terete, 28–120 cm; nodal glands absent.

submersed and floating or submersed only.

both submersed and floating or 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.

elliptic to oblong-elliptic, 40–190 × 20–65 mm, light green;

base cuneate;

tip round-mucronate;

veins 13–29;

petioles 20–90 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 or sessile, attached to stem nodes, not attached to stipules;

stipules 10–80 mm;

tip acuminate;

blades elliptic to lanceolate (linear), often falcate, 50–200 × 2–45 mm;

base acute;

margins entire, often wavy;

tip acute-mucronate; lacunae in 2–5 rows on each side of midrib;

veins 7–19;

petioles 0–40 mm.

emersed;

spikes cylindric, 10–35 mm;

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

emersed;

spikes cylindric, 25–70 mm;

peduncles terminal or axillary; erect to ascending, cylindric, 4–30 cm.

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 to ovoid, laterally compressed, dorsally keeled, 2.5–3.6 × 2.1–3 mm; grayish green to olive green, laterally ridged; dorsal keel well developed;

beaks erect to slightly recurved, 0.5–0.8 mm.