Flora of North America species comparison

emersed;

petiole triangular, 10–40 cm;

blade sagittate, 4.5–10 × 0.2–2 cm, basal lobes ± equal to remainder of blade.

emersed;

petiole 5-ridged, ascending to erect, 24.5–60 cm;

blade sagittate, 11.5–26.5 × 0.8–15 cm, basal lobes longer than remainder of blade.

racemes, of 2–4 whorls, emersed, 5–14 × 2–4 cm;

peduncles 20–38 cm;

bracts distinct or if connate, then less than ¼ total length, lanceolate, 5–25 mm, not papillose; fruiting pedicels spreading, cylindric, 1.5–3.5 cm.

racemes, rarely panicles, of 5–17 whorls, emersed, 20–37 × 5–27 cm;

peduncles 25–96 cm;

bracts connate more than or equal to ¼ total length, lanceolate, 6.5–15 mm, delicate, not papillose; fruiting pedicels spreading, cylindric, 1.5–4.4 cm.

to 30 mm diam.;

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

filaments linear, longer than to equal length of anther, glabrous;

pistillate pedicellate, without ring of sterile stamens.

to 3 cm diam.;

sepals recurved to spreading, not enclosing flower;

filaments cylindric, shorter than anthers, glabrous;

pistillate flowers pedicellate, without ring of sterile stamens.

heads 1–1.8 cm diam.;

achenes cuneate to obovoid, without abaxial keel, 2.4–4 × 1.5–3.8 mm, beaked;

faces not tuberculate, wings 1–3, ± entire, glands 1–2;

beak lateral, obliquely ascending, (0.7–)1–2.1 mm.

heads 0.9–1.5 cm diam;

achenes oblanceoloid, abaxially keeled, 1.2–2.5 × 0.8–1.6 mm, beaked;

faces tuberculate, wings absent, glands 0–1;

beak lateral, erect, 0.1–0.6 mm.

= 22.