Flora of North America species comparison

1–10+, erect, scabroso-puberulent proximal to arrays distally, in strips proximal to leaves.

basal 0;

mid and distal cauline sometimes numerous (75+), somewhat crowded, sessile, blades (dark green) linear-lanceolate to lanceolate, 25–150 × 2–15 mm, margins serrate to entire, scabroso-ciliate, 3-nerved, faces glabrous or with short hairs in lines along nerves.

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.

1–5 mm, sparsely to moderately strigillose;

bracteoles 1–3, linear-lanceolate.

narrowly campanulate, 3–5 mm.

10–15;

laminae 2–3 × 0.1–0.6 mm.

6–10;

corollas 3–4 mm, lobes 0.6–1.1 mm.

in 3–4 series, strongly unequal (greenish), outer lanceolate, inner oblong-lanceolate, margins ciliate-fimbriate apically, midnerves swollen apically, apices obtuse to rounded, glabrous.

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

50–350, in secund, usually elongate, pyramidal paniculiform arrays, branches recurved and secund.

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

(narrowly obconic) 1.1–1.5 mm (ribbed), sparsely strigillose;

pappi 2.5–3 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, 54.