Flora of North America species comparison

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

usually single, glabrous proximally, hirsuto-puberulent in arrays, sometimes irregularly or decurrently so proximally.

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.

proximalmost withering, smaller;

basal and proximal cauline tapering to winged petioles, blades elliptic to elliptic-obovate or subrhombic, mostly 60–150 × 10–50 mm, margins serrate, usually acuminate, glabrous or scabrellous distally;

mid and distal cauline sessile, blades mostly rhombic-elliptic to narrowly lanceolate, 20–40 × 5–8 mm.

3.1–10.3 mm, glabrate to sparsely strigillose;

bracteoles few, linear.

1–4 mm, bracteolate.

campanulate, 3–7 mm.

campanulate, 4–6 mm.

7–16;

laminae 2–5 × 0.7–0.9 mm.

6–9;

laminae 2–3 × 1–1.5 mm.

6–31;

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

mostly 8–12;

corollas 4–4.5 mm, lobes 1–1.5 mm.

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

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

in 3–4 series, appressed, unequal (outer 1/2 length of inner), linear to lanceolate-deltate (inner series usually striate with 2 prominent secondary nerves), apices narrowly acute or minutely obtuse.

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.

50–250, in elongate, narrowly paniculiform arrays, leafy-bracteate proximally, not secund, proximal branches sometimes elongated and ascending.

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

pappi 1.9–5.2 mm (bristles sometimes clavate).

(tan) 1.75–2.5 mm, usually glabrous, sometimes sparsely strigose;

pappi 1.5–2.5 mm.

= 18.