Flora of North America species comparison

solitary or several from base, erect or ascending, branched in distal 2/3 (in inflorescence), 10–40(–45) cm.

procumbent, occasionally ascending, usually producing axillary shoots below 1st-order inflorescence or at proximal nodes, 20–50(–60) cm.

blade obovate-oblong, ovate-lanceolate, oblong-lanceolate, or lanceolate; 2–6(–10) × 0.5–2 cm, base hastate (with spreading lobes), auriculate, or occasionally without evident lobes, margins entire, flat, apex obtuse or subacute.

blades ovate-lanceolate, elliptic-lanceolate, or ovate-elliptic, 3–12 × 1–5 cm, usually not more than 2–3.5 times as long as wide, widest near middle or occasionally in proximal 1/2, thick, coriaceous, base broadly cuneate, occasionally almost truncate or cuneate, margins entire, flat, apex acute.

terminal, occupying distal 2/3 of stem, usually lax and interrupted, narrowly paniculate.

terminal and axillary, terminal usually occupying distal 1/3–1/2 of stem, dense or interrupted only near base, usually broadly paniculate (branches simple or nearly so).

articulated in proximal part, filiform, 1.5–2.5(–3) mm, articulation indistinct or slightly swollen.

articulated in proximal 1/3 or almost near base, usually rather thick, 4–9 mm, not more than 2–2.5 times as long as inner tepals, articulation distinctly swollen.

3–6(–8) in whorls;

inner tepals orbiculate or broadly ovate, 2.5–3.2 × 2.7–3.2 mm, base broadly cordate or rounded, apex obtuse or subacute;

tubercles absent or some inner tepals with slightly swollen central veins.

10–25 in whorls;

inner tepals broadly ovate, ovate, or lingulate-deltoid, (3–)4–5 × (2.5–)3–4 mm, base rounded or subtruncate, margins entire or indistinctly erose, apex acute or subacute;

tubercle 1, large, subequal to inner tepals, or slightly narrower than inner tepals (then free margins of inner tepal distinctly narrower than tubercle), subglabrous to verrucose.

brown or dark brown, 0.9–1.2 × 0.6–0.8 mm.

brown or dark reddish brown, 2–2.5 × 1.7–2.1 mm.

= 8 (pistillate plants), 9 (staminate plants), 10 (both sexes).

= 20.