Flora of North America species comparison

emersed or submersed, phyllodial or rarely dilated apically, flattened, 4–40 cm × 0.05–0.4(–0.5) cm.

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, of 1–5 whorls, emersed, 2–20 × 1.5–12 cm;

peduncles 7–59 cm;

bracts connate more than or equal to ¼ total length, oblanceolate, 0.2–0.3 mm, delicate, not papillose; fruiting pedicels spreading, cylindric, 0.5–6 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 1.3 cm diam.;

sepals recurved to spreading, not enclosing flower;

filaments dilated, shorter than anthers, minutely tomentose;

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 0.5–1 cm diam.;

achenes obovoid, abaxially keeled, 2.2–2.8 × 1.5–2 mm, beaked;

faces not tuberculate, wings 1–2, ± entire, glands 3–5;

beak lateral, incurved-erect, 0.2 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.