OregonFlora species comparison

rhizomes absent; tubers present.

rhizomes absent; tubers oblong.

emersed;

petioles ascending to erect; to 50 cm;

blades sagittate, 1–30 × 2–15 cm.

emersed leaves to 45 cm;

petioles recurved;

blades linear to sagittate, 2–18 × 2–10 cm, floating leaves to 100 cm;

blades usually sagittate or cordate, 7–8 × 3–4 cm, submersed leaves flat; to 40 cm.

emersed, with 3–9 whorls, 4–25 cm;

peduncles 10– 55 cm; lowest inflorescence node with 3 pistillate flowers;

pedicels cylindrical, 0.5–3.5 cm.

emersed, with 2–10 whorls, 10–20 cm; lowest inflorescence node with 3 pistillate flowers;

peduncle 10–50 cm;

pedicels cylindrical, 0.5–2 cm.

to 4 cm in diameter;

sepals recurved to spreading;

petals without spot at base.

to 25 mm in diameter;

sepals recurved;

petals without spot at base.

heads 1–2 cm in diameter;

achenes oblanceolate, 2–3.5 mm;

wings absent;

beaks lateral or horizontal, 1–2 mm.

heads 0.5–1.5 cm in diameter;

achenes ovoid, 1–2.5 mm;

wing 1 or absent;

beaks terminal; erect, 0.1–0.5 mm.

perennial.