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.

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.

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.

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.

= 22.