Flora of North America species comparison

erect, branched in distal 2/3 (sometimes with few flowering stems from rootstock), 30–80(–120) cm.

erect or, rarely, ascending, simple or producing axillary shoots below 1st-order inflorescence or at proximal nodes, 40–100(–150) cm.

ocrea deciduous to partially persistent at maturity;

blade oblong-lanceolate, obovate-lanceolate, or lanceolate, normally (5–)10–30 × 2.5–6 cm, base broadly cuneate, rounded, or truncate, rarely subcordate, margins entire, flat to very weakly undulate, apex subacute, occasionally obtuse.

blades with lateral veins forming angle of 45–60° with midvein, linear-lanceolate or lanceolate, 5–30(–40) × 1–5 cm, usually 5–7(–10) times as long as wide, normally rather thin or at most subcoriaceous, base narrowly cuneate, margins entire, flat or slightly undulate, apex acute or acuminate.

terminal, occupying distal 2/3 of stem, lax, interrupted, broadly paniculate, branches simple or nearly so, almost all but distalmost whorls with subtending leaves;

panicle leafy at least in proximal 2/3 of length.

terminal and axillary, terminal usually occupying distal 1/3–1/2 of stem, usually lax, interrupted at least in basal 1/2, narrowly paniculate.

articulated in proximal 1/3 or occasionally near middle, filiform, 1–4(–5) mm, ca. as long as inner tepals or slightly longer, articulation distinctly swollen.

articulated in proximal part, distinctly thickened distally, 10–17 mm, (2.5–)3–5 times as long as inner tepals, articulation distinctly or slightly swollen.

10–20 in dense remote whorls;

inner tepals oblong-lanceolate, oblong, or lingulate, 2–3 × 1–1.6(–2) mm, ca. 2 times as long as wide, base cuneate or truncate, margins entire, apex obtuse;

tubercles 3, equal or subequal, largest tubercle almost as wide as inner tepal.

10–15(–25) in remote whorls;

inner tepals ovate-triangular or ovate-deltoid, 3.5–5 × 2.5–4 mm, longer than wide or, very rarely, as long as wide, base truncate or rounded, margins entire or, rarely, very indistinctly erose, apex acute or subacute (then with broadly triangular-lingulate tip);

tubercles 3, equal or subequal, minutely punctate and/or transversely rugose (wrinkled) in proximal part.

usually dark reddish brown, 1.5–1.8 × 1–1.4 mm.

brown or dark brown, 2.3–3.1 × 1.6–2.2 mm.

= 20.

= 60.