Flora of North America species comparison

1–10+, ascending to erect, proximally glabrous, strigose in arrays.

1–5+, erect, glabrous or branches of arrays puberulent.

basal and proximal cauline petiolate, blades narrowly oblanceolate, (20–)50–100(–160) × (2–)5–16(–56) mm, margins serrate to crenate, apices acute to obtuse, glabrous;

mid and distal sessile, similar, blades lanceolate to linear, 12–45 × 2–19 mm, reduced distally, margins entire to sparsely serrate, sometimes resinous.

basal and proximal cauline withering by flowering;

mid and distal cauline numerous (to 50+ on taller stems), sessile or nearly so (bases of blades sometimes subauriculate and rounded to short petioles), blades elliptic or lanceolate-elliptic, larger 60–150 × 15–35 mm, little reduced distally, margins serrate to entire, not 3-nerved, obscurely to obviously reticulately nerved, faces barely rugose, glabrous.

3.1–10.3 mm, glabrate to sparsely strigillose;

bracteoles few, linear.

4–10 mm, sparsely to moderately strigose;

bracteoles 1–3+, linear-lanceolate, usually a few near head grading into phyllaries.

campanulate, 3–7 mm.

campanulate, 4–6 mm.

7–16;

laminae 2–5 × 0.7–0.9 mm.

6–10;

laminae 2–3 × 0.8–1.3 mm.

6–31;

corollas 4–4.9 mm, lobes 0.6–1.3(–2) mm.

4–7;

corollas 3–4 mm, lobes 0.9–1.3 mm.

(in 3–4 series) strongly unequal, often resinous;

outer ovate, acute, inner linear-oblong, obtuse.

in 4–5 series, strongly unequal, margins apically ciliate, obtuse to rounded, glabrous;

outer ovate-lanceolate, inner linear-lanceolate, relatively broad, 0.7–1.2 mm.

3–150, not secund, in narrowly elongate, paniculiform arrays, broadly so in robust plants (12.5–19 × 2.5–3 cm wide), consisting of short axillary and terminal racemiform clusters, proximal branches elongate in larger plants, branches glabrate to strigillose.

35–800, in paniculiform arrays, sometimes leafy-bracteate, with short or elongate, slightly to strongly recurved, secund branches.

narrowly obconic, 1.9–3.2 mm, sometimes with dark ridges, strigillose;

pappi 1.9–5.2 mm (bristles sometimes clavate).

(obconic) 1.5 mm, sparsely strigose;

pappi 3.5–5 mm.

= 18, 36, 54.