Flora of North America species comparison

erect or ascending, usually producing axillary shoots below 1st-order inflorescence or at proximal nodes, 30–60(–90) cm.

erect (some dwarf alluvial forms may be with ascending or almost prostrate branches), branched in distal 2/3, occasionally almost near base, (4–)15–60(–70) cm.

blades light green to yellowish green, linear-lanceolate, occasionally lanceolate, 6–14 × 1–3.5(–4) cm, usually ca. 5–7 times as long as wide, widest near middle, thin, not coriaceous, base cuneate, margins entire, flat or undulate, apex acute or attenuate.

ocrea mostly partially persistent at maturity;

blade lanceolate or lanceolate-linear, rarely oblong-lanceolate, (3–)5–25(–30) × (1–)1.5–3(–4) cm, more than 4 times as long as wide, base abruptly truncate, slightly cordate, or rarely broadly cuneate, margins entire or subentire to obscurely repand, normally undulate and crisped, apex acute very rarely subobtuse.

terminal and axillary, terminal usually occupying distal 1/5–1/3 of stem, rather dense or interrupted in proximal 1/2, usually broadly paniculate (branches simple or with few 2d-order branches).

terminal, occupying distal 1/2 of stem (occasionally most of stem), usually reddish brown or red (greenish yellow when mature), usually rather dense, interrupted in proximal part, broadly paniculate.

articulated in proximal 1/3 or almost near base, filiform (thickened distally), 4–7 mm, not more than 2–2.5 times as long as inner tepals, articulation indistinctly swollen.

articulated near base or at least in proximal 1/3, filiform, 3–7(–9) mm, articulation weakly evident, occasionally indistinctly swollen.

10–20 in whorls;

inner tepals broadly ovate-triangular, occasionally broadly triangular, 3.5–4.5(–5) × 3.5–4(–5) mm, base truncate or indistinctly cordate, margins entire or indistinctly erose, apex obtuse or subacute;

tubercles 3, equal or subequal (much narrower than inner tepals).

15–30 (occasionally more) in rather dense whorls;

inner tepals narrowly triangular or narrowly rhombic-triangular, 1.5–2.5 × 0.7–0.9(–1.2) mm (excluding teeth), normally ca. 2 times as long as wide, base truncate or broadly cuneate, margins usually prominently dentate, rarely with shorter teeth, or almost entire, apex acute, straight, teeth 2–3, at each side of margins, subulate-filiform, bristlelike, straight, 1–3 mm, usually 1.5–2.5(–4) times as long as width of inner tepals;

tubercles 3, brownish or reddish, linear-lanceolate to fusiform, equal or subequal, rarely unequal, distinctly narrower than inner tepals, ca. 0.5 times as wide as inner tepals or less, apex acute or subacute, usually distinctly reticulate-pitted (especially in herbarium specimens).

brown or dark reddish brown, 2–3 × 1.5–2 mm.

light brown, 1.1–1.4 × 0.6–0.8 mm.

= 40.

= 40.