OregonFlora species comparison

flattened, 10–90 cm; nodal glands absent.

terete, 6–110 cm; nodal glands absent.

submersed and floating or submersed only.

submersed and floating or rarely 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.

lanceolate to round elliptic, 43–92 × 25–38 mm, light green;

base rounded to cordate;

tip acute to rounded;

veins 27–49;

petioles 23–226 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, attached to stem nodes, not attached to stipules;

stipules 15–117 mm;

tip acute;

blades ovate to oblanceolate, distinctly falcate, 50–125 × 15– 58 mm;

base rounded to acute;

margins entire and recurved; wavy;

tip acute to round-apiculate;

veins 19–49;

petioles terete, 0.9–11.5 cm.

emersed;

spikes cylindric, 8–40 mm;

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

emersed;

spikes cylindric, 34–65 mm;

peduncles terminal or axillary; erect, cylindric, 45–223 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.

sessile, obovoid; turgid, 5–6.7 × 4.5–5.2 mm; reddish brown, dorsally keeled, laterally ridged;

beaks erect, 0.5–0.8 mm.