OregonFlora species comparison

terete, 30–90 cm; nodal glands absent.

terete; to 100 cm; nodal glands absent.

submersed and floating.

submersed and floating, or submersed only.

elliptic to ovate, 35–110 × 15–60 mm;

base rounded to cordate;

tip acute to rounded;

veins 17–37;

petioles 55–290 mm.

lenticular to elliptic, 30–110 × 15–45 mm, green;

base cuneate to rounded;

tip acute to rounded;

veins 9–21;

petioles 3.5–26 cm.

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

stipules 45–100 mm; whitish, fibrous;

tip obtuse;

blades rigid, linear, subterete, 9–20 cm × 0.7–2.5 mm;

base slightly tapering;

margins entire;

tip obtuse;

veins 3–5, obscure.

attached at stem node, not attached to stipules;

stipules 30–90 mm;

tip round to acute;

petioles 20– 130 mm;

blades linear-lanceolate to lance-elliptic, 90–200 × 10–35 mm;

base acute;

margins entire;

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

veins 7–15.

emersed;

spikes cylindric, 25–50 mm;

peduncles terminal; erect to ascending, 45–95 mm.

emersed;

spikes cylindric, 20–70 mm;

peduncles terminal; erect to ascending, cylindric, 30–150 mm.

sessile, obovoid; turgid, 3.5–5 × 2–3 mm, green to greenish brown, not keeled;

beaks erect to apically recurved, 0.4–0.8 mm.

sessile, obovoid, 2.7–4.3 × 2.5–3 mm, red to reddish brown, dorsally keeled, laterally ridged;

lateral ridges with blunt to sharp tips;

beaks erect.