Flora of North America species comparison

emersed or submersed; submersed leaves phyllodial, flattened, 30–70 cm, rarely widening into blade; emersed leaves phyllodial, flattened, or petiole triangular, 34–50 cm, blade linear to elliptic, rarely hastate to sagittate, 5–15 × 0.6–12 cm, basal lobes when present shorter than remainder of blade.

emersed;

petiole terete, 44–58 cm;

blade linear to ovate or elliptic, 20.3–35 × 0.7–16 cm.

racemes, of 2–8 whorls, emersed, 8–10 × 2–6 cm;

peduncles 10–115 cm;

bracts connate more than or equal to ¼ total length, ovate, 3–6 mm, delicate, not papillose; fruiting pedicels absent.

racemes or panicles, of 6–13 whorls, emersed, 16–72 × 19–60 cm;

peduncles 75–125.5 cm;

bracts connate more than or equal to ¼ total length, lanceolate to ovate-lanceolate, 3–32 mm, coarse, papillose or not; fruiting pedicels spreading, cylindric, 0.6–3.8 cm.

to 3 cm diam.;

sepals recurved, not enclosing flower;

filaments dilated, shorter than anthers, pubescent;

pistillate sessile to subsessile, without ring of sterile stamens.

to 3.3 cm diam.;

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

filaments cylindric, longer than anthers, pubescent;

pistillate pedicellate, without ring of sterile stamens.

heads 1–1.7 cm diam.;

achenes obovoid to oblong, abaxially keeled, 2–3 × 1.3–1.6 mm, beaked;

face not tuberculate, wings 1–2, ± entire, glands 1;

beak lateral, recurved, 0.8–1.4 mm.

heads 0.5–1.2 cm diam.;

achenes oblanceoloid, abaxially keeled, 1.6–2.5 × 0.8–1.1 mm, beaked;

faces not tuberculate, wings absent, glands 1;

beak lateral, erect, 0.3–0.7 mm.

= 22.