Flora of North America species comparison

emersed;

petiole triangular, erect to ascending, 6.5–51 cm;

blade sagittate, rarely hastate, 1.5–30.5 × 2–17 cm, basal lobes equal to or less than remainder of blade.

submersed, phyllodial, lenticular, 5–40 ´ 0.1–0.4 cm, or rarely floating;

petiole terete, 2.4–4 cm;

blade linear-lanceolate to ovate, 1–2.5 ´ 0.3–1.5 cm.

racemes, rarely panicles, of 3–9 whorls, emersed, 4.5–28.5 × 4–23 cm;

peduncles 10–59 cm;

bracts connate more than or equal to ¼ total length, elliptic to lanceolate, 3–8 mm, delicate, not papillose; fruiting pedicels spreading, cylindric, 0.5–3.5 cm.

racemes, of 2–7 whorls, floating, 2–11 ´ 1.5–4.5 cm;

peduncles 5–40 cm;

bracts connate more than ¼ total length, subulate, 1.5–4.2 mm, delicate, not papillose; fruiting pedicels recurved, cylindric to club-shaped, 0.2–1.1 cm.

to 4 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.

0.4–1.2 cm diam.;

sepals spreading to recurved in staminate, erect in pistillate, enclosing flower or fruiting head;

filaments dilated, longer than anther, glabrous;

pistillate pedicellate, occasionally with ring of sterile stamens.

heads 1–1.7 cm diam;

achenes oblanceoloid, without abaxial keel, 2.5–3.5 × to 2 mm, beaked;

faces not tuberculate, wings absent, glands (0–)1(–2);

beak lateral, horizontal, 1–2 mm.

heads 0.55–0.8 cm diam.;

achenes oblanceoloid, abaxially keeled, 2 ´ 1.5 mm, beaked;

faces not tuberculate, wings 1–2, crenate, glands 0–1;

beak lateral, erect, 0.2–0.4 mm.

= 22.

= 22.