OregonFlora species comparison

terete to flattened; to 150 cm; nodal glands absent.

submersed and floating or submersed only.

elliptic to ovate, 35–40 × 16–20 mm, yellow-green to dark green;

base rounded;

tip acuminate;

veins 11–13;

petioles 30–45 mm.

sessile or rarely petiolate, attached to stem nodes, not attached to stipules;

stipules 10– 16 mm;

tip acute to obtuse;

blades linear to narrowly lanceolate or oblanceolate, 31–91 × 3–27 mm;

base attenuate;

margins entire, rarely wavy;

tip acuminate; lacunae in 1–2 rows on each side of midvein;

veins 3–7(9);

petioles to 30 mm.

emersed;

spikes cylindric, 15–35 mm;

peduncles axillary and terminal; erect to ascending, cylindric, 32–77 mm.

sessile; ovoid, laterally compressed, 1.9–2.3 × 1.8–2 mm; greenish brown, dorsally and laterally keeled;

beaks erect, 0.3–0.5 mm.