Flora of North America species comparison

erect (some dwarf alluvial forms may be ascending or almost prostrate), branched in distal 2/3, occasionally almost near base, (5–)15–75(–100) cm.

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

ocrea deciduous to partially persistent at maturity;

blade lanceolate or lanceolate-linear, rarely oblong-lanceolate, usually very gradually narrowed at both ends, (4–)7–25(–40) × (1–)1.5–4(–5) cm, at least 4 times as long as wide, base narrowly cuneate, very rarely broadly cuneate, margins entire, flat or rarely weakly undulate, apex acute, very rarely subobtuse.

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, occupying distal 1/2 of stem, occasionally most of stem, golden or greenish yellow, usually rather dense or interrupted in proximal part, broadly paniculate, branches spreading.

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 near base or at least in proximal 1/3, filiform, 3–8 mm, articulation weakly evident.

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.

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

inner tepals narrowly triangular or narrowly rhombic-triangular, 2.5–3(–3.5) × 0.75–1.2(–1.5) mm (excluding teeth), normally ca. 2 times as long as wide, base truncate or broadly cuneate, margins prominently dentate, apex acute, very rarely subacute, straight, teeth 2–3(–4), normally at each side of margins, subulate-filiform, bristlelike, 1–3.5 mm, usually 1.5–2 times as long as width of inner tepals;

tubercles 3, equal or subequal, apex acute or subacute, smooth.

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.

light brown, small, 0.9–1.75 × 0.6–1 mm.

brown or dark reddish brown, 2 × 1.3 mm.

= 40.

= 20.