Flora of North America species comparison

submersed and emersed; submersed sessile, phyllodial, flattened, to 26 × 0.5 cm; emersed with petiole ± triangular, 21–70.5 cm, blade linear-ovate to ovate, 4.6–16.4 × 0.7–6.1 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, of 3–9 whorls, emersed, 2.5–10 × 2–4.5 cm;

peduncles 22–60 cm;

bracts connate more than ¼ total length, lanceolate, 3–5.5 mm, delicate, not papillose; fruiting pedicels spreading to recurved, cylindric, 0.5–3 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 1.8 cm diam.;

sepals spreading to recurved, not enclosing flower or fruiting head;

filaments dilated, longer than anthers, pubescent;

pistillate 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 0.7–1.2 cm diam.;

achenes oblanceoloid, not abaxially keeled, 1.2–2 × 0.8–1.2 mm, beaked;

faces tuberculate, wings absent, glands absent;

beak lateral, horizontal to erect, 0.3–0.6 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."

= 22.