OregonFlora species comparison

terete; to 200 cm; nodal glands absent.

terete; to 210 cm; nodal glands absent.

submersed and floating or submersed only.

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

stipules 30– 81 mm, fibrous, shredding at tip;

blades linear-lanceolate, 50–200 × 10–30 mm;

base clasping but without basal lobes, rarely wavy;

tip obtuse;

veins 11–33.

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, 34–75 mm;

peduncles terminal or axillary; erect to spreading, 10–30 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; turgid, 4–5.7 × 3.2–4 mm; greenish brown, dorsally keeled, occasionally laterally keeled;

beaks erect, 0.6–1 mm.