OregonFlora species comparison

flattened, 4–75 cm; nodal glands rarely present.

terete, 6–110 cm; nodal glands absent.

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

stipules 2–22 mm; greenish to brown, membranous to slightly fibrous;

veins not persisting;

blades linear, 13–82 × 0.3–2.3 mm;

margins entire;

tip acute to apiculate; lacunae rarely present;

veins 1–3(5).

submersed and floating or rarely submersed only.

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.

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 continuous (rarely interrupted), 1.5–7 mm;

peduncles axillary, recurved, 3–11(37) mm.

emersed;

spikes cylindric, 34–65 mm;

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

sessile; round to obovoid, flattened, 1.5–2.7 × 1.2–2.2 mm; olivegreen to green-brown, dorsally and laterally keeled;

beaks erect, 0.2–0.6 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.