Flora of North America species comparison

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

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 (rosettes) usually withering by flowering;

petiole bases or vasculature not persisting on rhizomes;

proximalmost cauline petiolate, sometimes present at flowering;

proximal and distal sometimes 3-nerved.

0.5–2 mm;

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

narrowly campanulate, 3–5 mm.

4–7;

laminae 2–3.5 × 0.2–0.7 mm.

4–6;

corollas 3 mm, lobes 1 mm.

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

1-nerved, usually not striate (3–5-nerved and striate in S. glomerata, S. lancifolia, S. roanensis) sometimes minutely stipitate-glandular, sometimes resinous.

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

in ± paniculiform or thyrsiform arrays (wand-, club-, or secund cone-shaped) or in axillary clusters, sometimes in rounded corymbiform arrays.

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

pappi 3 mm.

bristles in 2–3 series (shorter, outer setiform scales rarely present, outer, longer bristles apically attenuate, inner bristles longest, weakly to strongly clavate).

= 18, 36.