OregonFlora species comparison

terete; to 200 cm; nodal glands absent.

flattened; to 100 cm; nodal glands absent.

submersed and floating or submersed only.

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

stipules persistent to deliquescent; to 0.5 cm;

tip obtuse;

blades linear, 12–90 × 4–10 mm;

base obtuse to rounded, not to slightly clasping;

margins conspicuously serrate; wavy;

tip round to acute; lacunae in 2–5 rows on each side of midrib;

veins 3–5.

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; terminal or rarely axillary;

spikes cylindric, 10–15 mm;

peduncles erect to ascending, 25–40 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 slightly concave, 6 × 2.5 mm, yellow to red or reddish brown, not dorsally or laterally keeled;

beaks apically recurved, 2–3 mm.