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.

erect, often flexuous in distal part, branched in distal 2/3, occasionally almost from base, 20–60(–70) 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.

ocrea deciduous or partially persistent at maturity;

blade oblong to ovate-oblong, sometimes broadly lanceolate or panduriform, contracted near middle or proximally, 4–10(–15) × (2–)3–5 cm, less than 4 times as long as wide, base normally truncate or weakly cordate, occasionally rounded, margins entire, flat or undulate, rarely slightly crisped, apex obtuse or subacute.

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

terminal, occupying distal 2/3 of stem or more, usually lax and interrupted, broadly paniculate, branches usually divaricately spreading, forming angle of 60–90° with 1st-order stem.

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

articulated in proximal 1/3 or occasionally near middle, thickened, not filiform, 2–5(–6) mm, 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.

10–20 in rather dense whorls;

inner tepals ovate-triangular, deltoid, or oblong-deltoid, 3–6 × 2–3 mm (excluding teeth), normally ca. 1.5 times as long as wide, base truncate, margins usually distinctly dentate, rarely subentire, apex obtuse to subacute, straight, teeth 2–5(–9), normally on margins at each side, narrowly triangular, 0.3–2.5 mm, longer or shorter than width of inner tepals;

tubercles (1–)3, equal or unequal, usually verrucose (warty).

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

dark reddish brown to almost black, 2–2.8 × 1.3–2 mm.

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

= 20.