OregonFlora species comparison

flattened, 10–90 cm; nodal glands absent.

terete, 28–120 cm; nodal glands absent.

submersed and floating or submersed only.

both submersed and floating or submersed only.

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

base acute;

tip rounded or bluntly cuspidate;

veins 11–41;

petioles 20–125 mm.

elliptic to oblong-elliptic, 40–190 × 20–65 mm, light green;

base cuneate;

tip round-mucronate;

veins 13–29;

petioles 20–90 mm.

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.

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

stipules 10–80 mm;

tip acuminate;

blades elliptic to lanceolate (linear), often falcate, 50–200 × 2–45 mm;

base acute;

margins entire, often wavy;

tip acute-mucronate; lacunae in 2–5 rows on each side of midrib;

veins 7–19;

petioles 0–40 mm.

emersed;

spikes cylindric, 8–40 mm;

peduncles axillary; erect, 15–50(160)mm.

emersed;

spikes cylindric, 25–70 mm;

peduncles terminal or axillary; erect to ascending, cylindric, 4–30 cm.

sessile; round to obovoid, flattened, dorsally and laterally keeled, 2.5–4.5 × 2–3.6 mm; greenish brown;

beaks erect, 0.5 mm.

sessile, obovoid to ovoid, laterally compressed, dorsally keeled, 2.5–3.6 × 2.1–3 mm; grayish green to olive green, laterally ridged; dorsal keel well developed;

beaks erect to slightly recurved, 0.5–0.8 mm.