OregonFlora species comparison

terete; to 200 cm; nodal glands absent.

terete; to 100 cm; nodal glands absent.

submersed and floating or submersed only.

submersed, conspicuously 2-ranked, sessile; more or less sti?;

blades attached to lower 25% of petiole;

stipules ligulate, 0.5– 2 cm, fibrous, shredding at tip;

tip obtuse;

blades linear to lanceolate, 20–70(120) × 3–4(8) mm;

base rounded, with basal lobes (auricles);

margins minutely spinulose to serrulate;

tip acute; lacunae absent;

veins 20–60.

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.

often branched;

peduncles axillary; erect, 30–50(70)mm;

spikes moniliform, 7–20 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.

stipitate, obliquely obovoid; turgid, 3–4(5) × 2(3.3)mm, brown, dorsally and laterally keeled;

beaks erect, recurved at tip, 0.7–0.9 mm.