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.

emersed or submersed, sessile, phyllodial, nearly terete; emersed, to 60 × 0.15–0.7 cm; submersed, 3.5–18.5 × 0.15–0.4 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 1–4 whorls, emersed, 2.5–4 × 2.5–6 cm;

peduncles 10–80 cm;

bracts connate more than or equal to total length, subulate, 2–3 mm, delicate, not papillose; fruiting pedicels obliquely ascending, filiform, 1 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 1.5 cm diam.;

sepals recurved, not enclosing flower;

filaments dilated, ± equaling anthers, pubescent; 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 0.6–1 cm diam.;

achenes obovoid-cuneate, abaxially keeled, 2–3 × 1.2–1.5 mm, beaked;

faces not tuberculate, wings absent, glands 1–2;

beak erect to horizontal, 0.3–0.4 mm.

= 22.

= 22.