OregonFlora species comparison

terete; to 100 cm; nodal glands absent.

terete to slightly compressed, 18– 150 cm; nodal glands present on at least some nodes; to 0.5 mm diameter, green; gold, brown, or rarely white.

submersed, conspicuously 2-ranked, sessile; more or less sti?;

blades attached to lower 25% of petiole;

stipules ligulate, 0.5– 2 cm, fibrous, shredding at tip;

tip obtuse;

blades linear to lanceolate, 20–70(120) × 3–4(8) mm;

base rounded, with basal lobes (auricles);

margins minutely spinulose to serrulate;

tip acute; lacunae absent;

veins 20–60.

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

stipules convolute, 3.1–9.2 mm, rarely fibrous;

tip acute to obtuse;

blades linear, 9–54 × 0.2–2.5 mm;

base slightly tapering;

margins entire;

tip subulate to obtuse; lacunae in 1–5 rows on each side of midrib;

veins 1–3(5).

often branched;

peduncles axillary; erect, 30–50(70)mm;

spikes moniliform, 7–20 mm.

submersed or emersed;

spikes capitate to cylindric, continuous to interrupted, 1.5–10.1 mm;

peduncles more than 3 per plant; axillary or terminal, cylindric to slightly clavate; erect, rarely recurved, 5–66 mm.

stipitate, obliquely obovoid; turgid, 3–4(5) × 2(3.3)mm, brown, dorsally and laterally keeled;

beaks erect, recurved at tip, 0.7–0.9 mm.

sessile; ovoid;

sides rounded, rarely concave, 1.5–2.2 × 1.2–1.6 mm, green to brown, not keeled;

beaks erect, located at middle of fruit tip, 0.1–0.6 mm.