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.

usually ascending, rarely decumbent-ascending or suberect, usually producing axillary shoots below 1st-order inflorescence or at proximal nodes, 30–60 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.

blades linear-lanceolate or linear-oblanceolate, 5–10 × 1–3 cm, usually ca. (3–)5–7 times as long as wide, usually widest near middle, thin or, occasionally, subcoriaceous, base cuneate, margins entire, flat or, occasionally, undulate near base, apex acute or attenuate.

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

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 in proximal 1/3 or almost near base, filiform, 3–8 mm, not more than 2–2.5 times as long as inner tepals, articulation 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).

10–15(–20) in whorls;

inner tepals usually broadly triangular or deltoid, 2.5–3.5 × 2.2–3.3 mm, base truncate, margins minutely but distinctly denticulate, rarely subentire, apex obtuse or subacute;

tubercles absent, or only 1 midvein slightly swollen.

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

brown or dark reddish brown, 2 × 1.3 mm.

= 40.

= 20.