OregonFlora species comparison

terete; to 200 cm; nodal glands absent.

terete; to 100 cm; nodal glands absent.

submersed and floating or submersed only.

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

stipules 1.2– 1.7 mm, fibrous, disintegrating to persistent fibers; even on proximal portion of stem;

tip shredding, obtuse;

blades ovate-lanceolate to narrowly lanceolate, 1–12 cm, 10–20 mm wide;

base rounded, clasping;

margins entire to wavy;

tip acute to obtuse; lacunae absent;

veins 3–35.

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.

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.

emersed;

spikes cylindric, 10–35 mm;

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

emersed;

spikes cylindric, 13–37 mm;

peduncles terminal or axillary; erect to rarely recurved, 15–148 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 to concave, 2.2–4.2 × 1.7–2.9 mm; greenish brown, rarely dorsally keeled;

beaks erect, 0.4–0.7 mm.