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.

submersed and emergent;

petiole triangular, 11.5–35 cm;

blade elliptic to ovate, 25–56 cm.

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 4–10 whorls, emersed, 8–25 × 5–36 cm;

peduncles to 76 cm;

bracts connate ¼ total length, lanceolate, 4–8 mm, papillose; fruiting pedicels ascending to spreading, cylindric, 1–4.5 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 cm diam.;

sepals appressed to spreading;

filaments slightly dilated, shorter 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 0.7–1 cm diam.;

achenes obovoid, abaxially keeled, 1.2–1.5 × 0.7–1.1 mm, beaked;

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

beak lateral, erect, 0.1–0.3 mm.

= 22.