OregonFlora species comparison

compressed, 10–35 cm; nodal glands absent.

terete, 30–90 cm; nodal glands absent.

both submersed and floating or submersed only.

submersed and floating.

obovate to elliptic; (10)15–30 × 3–8.5 mm, light green;

base acute;

tip round to acute;

veins 3–7;

petioles 7–8 mm.

elliptic to ovate, 35–110 × 15–60 mm;

base rounded to cordate;

tip acute to rounded;

veins 17–37;

petioles 55–290 mm.

sessile with blade attached to stipule near middle;

stipules persistent to decomposing, ligulate, 15–23 mm;

tip obtuse;

blades linear, often falcate, 20–40 × 0.5– 1(1.5) mm;

base slightly tapering;

margins entire;

tip acute; lacunae in 1–2 rows on each side of midrib;

vein 1.

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.

submersed spikes capitate, 2–3 mm, emersed spikes cylindric, 5–9.7 mm;

peduncles axillary, recurved, 3–5 mm, emersed peduncles axillary or terminal; erect to slightly recurved, 6–15 mm.

emersed;

spikes cylindric, 25–50 mm;

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

sessile, orbicular, compressed, 1–1.5 × 0.9–2 mm; greenish brown, dorsally and laterally winged;

lateral wings with sharp points;

beaks erect, 0.1 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.