Flora of North America species comparison

emersed;

petiole terete-ridged, to 39 cm;

blades sagittate, 5–20 × 2–8 cm, basal lobes equal to or less than remainder of blade.

emersed, sessile, phyllodial, linear to lanceolate, flattened, 15–25(–40) × 1.5–4 cm, or petiole triangular, 15–50 cm, blade linear to elliptic-lanceolate, 4–10 × 0.3–2 cm.

racemes or panicles, of 5–12 whorls, emersed, 25–30 × 6–15 cm;

peduncles to 45 cm;

bracts distinct or if connate, then less than ¼ total length, long-acuminate, 10–40 mm, firm, not papillose; fruiting pedicels spreading to ascending, cylindric, 1–2.5 cm.

racemes, of 3–6 whorls, 1.5 × 4 cm;

peduncle 20–60 cm;

bracts connate greater than or equal to ¼ total length, ovate, 4–10 mm, nearly scarious, not papillose; fruiting pedicels spreading, cylindric, 0.8–3 cm.

to 3.5 cm diam.;

sepals recurved to spreading, not enclosing flower;

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

to 0.8 cm diam.;

sepals recurved to spreading, not enclosing flower;

filaments dilated, exceeding anthers in length, pubescent; pistillate pedicellate, without ring of sterile stamens.

heads (1.2–)1.5–2.5 cm diam.;

achenes cuneate-obovoid, without abaxial keel, 2.1–3.1 × 1.4–2.2 mm, beaked;

faces ??, wings 0–2, ± entire, glands absent;

beak lateral, ascending apically, 0.4–1.7 mm.

heads 1.2–2 cm diam.;

achenes cuneate-obovoid, abaxially keeled, 2.5–3 × 1.4–1.8 mm, beaked;

faces not tuberculate, wings 1, ± entire, glands absent;

beak ascending to horizontal, 0.4–0.7 mm.

datum is whether faces are tuberculate or not;

if datum is not easily available, change wording to near-original "faces with 0–2 wings."