Flora of North America species comparison

submersed or emersed; submersed leaves phyllodial, angled abaxially, flattened adaxially, 6.4–35 × 0.5–4 cm; emersed with petiole triangular, 6.5–17 cm, blade linear to linear-oblanceolate, 2.5–17.4 × 0.2–4 cm.

emersed;

petiole terete-ridged, to 39 cm;

blades sagittate, 5–20 × 2–8 cm, basal lobes equal to or less than remainder of blade.

racemes or panicles, of 1–12 whorls, emersed, 2.5–21 × 1–8 cm;

peduncles 6.5–29.7 cm;

bracts connate more than to equal to ¼ total length, broadly subulate to lanceolate, 20–50 mm, coarse, not papillose; fruiting pedicels spreading, cylindric, 0.5–5 cm.

racemes or panicles, of 5–12 whorls, emersed, 25–30 × 6–15 cm;

peduncles to 45 cm;

bracts distinct or if connate, then less than ¼ total length, long-acuminate, 10–40 mm, firm, not papillose; fruiting pedicels spreading to ascending, cylindric, 1–2.5 cm.

to 2.3 cm diam.;

sepals recurved to spreading, not enclosing flower;

filaments dilated, shorter than anthers, pubescent;

pistillate flowers pedicellate, without ring of sterile stamens.

to 3.5 cm diam.;

sepals recurved to spreading, not enclosing flower;

filaments cylindric, longer than anthers, glabrous;

pistillate pedicellate, without ring of sterile stamens.

heads 0.6–1.5 cm diam.;

achenes oblanceoloid, without abaxial keel, 1.5–2.8 × 1.1–1.5 mm, beaked;

faces not tuberculate, abaxial wings 0–1, ± entire, glands 1–2;

beak lateral, erect, 0.2 mm.

heads (1.2–)1.5–2.5 cm diam.;

achenes cuneate-obovoid, without abaxial keel, 2.1–3.1 × 1.4–2.2 mm, beaked;

faces ??, wings 0–2, ± entire, glands absent;

beak lateral, ascending apically, 0.4–1.7 mm.

datum is whether faces are tuberculate or not;

if datum is not easily available, change wording to near-original "faces with 0–2 wings."