OregonFlora species comparison

terete, 30–90 cm; nodal glands absent.

submersed and floating.

elliptic to ovate, 35–110 × 15–60 mm;

base rounded to cordate;

tip acute to rounded;

veins 17–37;

petioles 55–290 mm.

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.

emersed;

spikes cylindric, 25–50 mm;

peduncles terminal; erect to ascending, 45–95 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.