Flora of North America species comparison

usually 1–3, ascending to erect, scabrous to loosely puberulent.

1–10+, erect, glabrous, sometimes sparsely hairy in arrays; usually with fascicles of small leaves in axils of distal leaves.

basal and proximal usually withering by flowering, tapering to long-winged petioles, blades oblanceolate, 30–100 × 7–20(–30) mm, margins serrate or crenate, mid usually largest, apices acute to obtuse, acuminate, faces scabrous;

mid and distal cauline subsessile (1 mm) or sessile, blades (sometimes ± shiny) elliptic to oblanceolate, 10–50 × 5–15(–25) mm, greatly reduced distally, grading into bracts, firm, bases convex-cuneate to rounded, margins finely serrate, often 3-nerved, nerves usually distinct abaxially, faces distinctly scabrous.

basal and proximal cauline tapering gradually to winged petioles, blades oblanceolate to ovate, 100–300 × 20–70 mm, usually multiple lateral nerves pronounced, margins sharply serrate, ciliate, faces glabrous;

mid to distal cauline sessile, blades linear-lanceolate, 30–50 × 8–11 mm, reduced distally, margins entire or finely serrate.

0.5–2 mm;

bracteoles 1–5, linear-lanceolate to ovate, minute, grading into phyllaries distally.

1.5–6 mm, glabrous or sparsely strigillose;

bracteoles 0–2, linear.

narrowly campanulate, 3–5 mm.

narrowly campanulate, 3–4 mm.

4–7;

laminae 2–3.5 × 0.2–0.7 mm.

7–12;

laminae 2–2.5 × 0.2–0.5 mm.

4–6;

corollas 3 mm, lobes 1 mm.

8–15;

corollas 2.5–3 mm, lobes 0.5–0.8 mm.

in 3–4 series, unequal, oblong, midnerves swollen distally, obtuse or acute to slightly acuminate.

in 3–4 series, strongly unequal, outer ovate, acute, inner lanceolate, obtuse.

20–260, in paniculiform arrays, narrowly to broadly secund, pyramidal, branches recurved, secund.

60–450, secund, in paniculiform arrays, openly secund-pyramidal with proximal branches spreading-recurved, or as broad as long with proximal branches widely ascending, recurved (elm-tree shaped).

1.5–2.5 mm, sparsely to moderately short-strigose;

pappi 3 mm.

0.9–1.5 mm, sparsely strigose;

pappi 2.5–3.5 mm.

= 18, 36.

= 18.