OregonFlora species comparison

terete; to 200 cm; nodal glands absent.

flattened, 10–90 cm; nodal glands absent.

submersed and floating or submersed only.

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.

narrowly oblanceolate to elliptic, 20–80 × 4–20 mm;

base acute;

tip rounded or bluntly cuspidate;

veins 11–41;

petioles 20–125 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.

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

stipules 10–30 mm;

tip obtuse;

blades linear, 50–220 × 1–10 mm;

margins entire;

tip blunt to acute; lacunae forming a prominent band along the midvein;

veins 3–13.

emersed;

spikes cylindric, 10–35 mm;

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

emersed;

spikes cylindric, 8–40 mm;

peduncles axillary; erect, 15–50(160)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; round to obovoid, flattened, dorsally and laterally keeled, 2.5–4.5 × 2–3.6 mm; greenish brown;

beaks erect, 0.5 mm.