Flora of North America species comparison

1(–5), erect, glabrous proximally to strigillose in arrays.

decumbent to ascending or erect, sometimes branched distally, glabrous or strigose, strigillose, hispid, or short-villous.

basal and proximal cauline (sometimes withering by flowering) tapering to winged petioles, blades lanceolate to ovate-elliptic, 50–300 (including petiole) × 12–80 mm (sometimes firm), margins sharply serrate to crenate or entire, faces glabrate to sparsely strigillose;

mid to distal cauline sessile, blades narrowly ovate to lanceolate or elliptic, 25–90 × 5–30 mm, gradually reduced distally, margins serrulate to entire (distally), ciliate, faces glabrous or sparsely scabroso-strigose.

basal (persistent or not by flowering) and cauline; petiolate (proximal) or sessile (proximal and distal, latter sometimes subpetiolate);

proximal blades sometimes 3-nerved, ovate-oblanceolate, margins often serrate, faces glabrous or densely hairy;

distal sometimes 3-nerved, glabrous or sparsely to densely scabrous, strigillose, or villous, sometimes stipitate-glandular, sometimes resinous.

1.5–3 mm, sparsely to moderately scabroso-strigillose;

bracteoles linear, grading into phyllaries, scattered along peduncles, clustered near heads.

narrowly campanulate, 4–6.5 mm.

campanulate to cylindric (often spreading upon drying), 3–12 × 1.7–10 mm.

slightly convex, pitted, epaleate.

(2–)3–7(–9);

laminae 3–4 × 0.5–1 mm.

(0–)2–15(–24), pistillate, fertile;

corollas yellow, rarely white (usually glabrous).

6–16;

corollas 2.5–4 mm, lobes 0.5–1.2 mm.

2–35(–60), bisexual, fertile;

corollas yellow, ± ampliate, tubes shorter than throats (usually glabrous), lobes 5, erect to spreading, triangular to narrowly lanceolate;

style-branch appendages broadly to narrowly triangular (lengths 0.7–1 times stigmatic lines).

in 3–4 series, appressed, strongly unequal, outer ovate, mid and inner lanceolate, (midnerves often raised and thick) apices acute to obtuse or rounded, glabrous.

10–35 in 3–5 series, midnerves usually ± swollen and translucent, sometimes plus 2–5 secondary nerves (striate, flat), linear-lanceolate to oblong or ovate, unequal to rarely subequal, margins scarious, (apices rounded to acute or attenuate), faces glabrous or sparsely pilose or puberulent, sometimes minutely stipitate-glandular, sometimes resinous.

15–300+, not secund, in usually dense, sometimes open, elongate, paniculiform to thyrsiform arrays, (5–)10–45 × (2–)3–7(–12) cm;

branches strongly ascending, often racemiform.

usually radiate, sometimes discoid, (1–)2–1500+ in racemiform (club-shaped or pyramidal), paniculiform or corymbo-paniculiform, sometimes secund arrays.

(narrowly obconic) 1.6–2.5 mm, glabrous;

pappi 3–4.5 mm.

narrowly obconic to cylindric, sometimes somewhat compressed, ribs usually 8–10 (either darker and sometimes translucent or lighter than bodies), glabrous or moderately strigillose;

pappi persistent, outer setiform scales (0.25–0.5 mm; rarely present) plus 2 series of 25–45 longer, barbellate bristles, mid apically attenuate, 90–95% length of inner, inner apically weakly to strongly clavate [(0.5–in S. sphacelata)1.5–5(–7.3) mm].

= 9.