Flora of North America species comparison

emersed;

petiole 5-winged, 19–85 cm;

blade sagittate, 3–19 × 2.5–11 cm, basal lobes ± equal to remainder of blade.

submersed and emersed; submersed phyllodial, flattened, 9.5–16.5 × 0.6–1.5 cm; emersed with petiole nearly terete, 3–25 cm, blade linear-lanceolate to ovate, 5.5–8.5 × 0.5–2.1 cm.

racemes, of 5–12 whorls, emersed, 10–29 × 3–5 cm;

peduncles 25–105 cm;

bracts distinct or if connate, then less than ¼ total length, lanceolate, 7–30 mm, papery, not papillose; fruiting pedicels spreading to ascending, cylindric, 0.3–2.3 cm.

racemes, of 2–5 whorls, emersed, 4.5–15 × 2–6 cm;

peduncles to 35 cm;

bracts connate ¼ total length, lanceolate, 2–4.5 mm, delicate, not papillose; fruiting pedicels spreading to recurved, cylindric, 1.5–4.5 cm.

to 3 cm diam.;

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

filaments cylindric, longer than anthers, glabrous; pistillate pedicellate, without ring of sterile stamens.

to 1 cm diam.;

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

filaments dilated, ± equaling anthers, glabrous; pistillate pedicellate, without ring of sterile stamens.

heads 1–2.2 cm diam.;

achenes obovoid, without abaxial keel, 2.1–3.2 × 1.4–2.3 mm, beaked;

faces not tuberculate, wings 0–2, ± entire, glands absent;

beak lateral, strongly recurved, 4–17 mm.

heads 0.5–0.6 cm diam;

achenes obovoid, abaxially keeled, 2.5–3 × 1.2–1.5 mm, beaked;

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

beak lateral, horizontal, ca. 0.5 mm.

= 22.