Flora of North America species comparison

1–10, ascending to erect, uniformly finely strigillose-villous distal to mid.

1–15+, decumbent to erect, proximally glabrous, sparsely strigose in array.

basal cauline nearly always withering well before flowering, linear-oblanceolate, smaller than proximal mid cauline, serrate;

proximal persisting, sometimes brown-black after senescence, often twisted;

proximal to distal numerous (100+ on tall stems), crowded, sessile, blades (bright green) linear to linear-lanceolate, 20–70 × 2–7(–10) mm, margins remotely serrulate (proximal) to entire or with 1–2 minute serrations (distal), obscurely 3-nerved, one or both faces glabrous or finely strigillose.

basal petiolate to sessile;

blades spatulate, 40–120 × 10–30 mm, subcoriaceous, margins crenate, apices acute to obtuse, glabrous;

many-leaved rosettes present at flowering;

cauline 9–19, sessile;

blades similar to basal proximally, becoming oblanceolate distally, reduced to 10 mm, margins entire, apices acute, often heavily resinous.

1–4 mm, finely strigilloso-villous;

bracteoles 0–2, linear, grading into phyllaries.

3–10 mm (longest), sparsely strigose;

bracts clustered near base of heads.

narrowly campanulate, 2.5–3.5 mm.

campanulate, 4–7 mm.

2–8;

laminae 1–2 × 0.25–0.5 mm.

4–10;

laminae 2–4 × 1–2 mm.

2–4(–6);

corollas 2.3–3.5 mm, lobes 0.4–1 mm.

10–18;

corollas 4.3–6 mm, lobes 0.7–1.5 mm.

in 3–4 series, strongly unequal;

outer ovate, acute, inner oblong, obtuse to rounded.

(15–24 in 3–4 series) unequal, very resinous;

outer ovate, obtuse, inner linear-lanceolate, obtuse or acute.

100–300+, in short to elongate, pyramidal paniculiform arrays, branches recurved, secund.

5–100+, not secund, in paniculiform arrays, or virgate to thyrsiform in robust plants, consisting of axillary and terminal racemiform clusters.

(narrowly obconic) 1 mm, strigillose;

pappi 2–3 mm.

appressed-strigose;

pappi 3.5–5.5 mm.

= 18.

= 18.