Flora of North America species comparison

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

1–5+, erect to arching, puberulent in arrays and in lines proximal to leaf bases or uniformly.

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.

usually anise-scented when crushed;

basal and proximal usually withering by flowering, tapering to broadly winged petioles, blades oblanceolate, margins entire, short-strigillose, faces glabrous or short scabroso-strigillose along main nerves;

mid and distal cauline sessile, blades lanceolate to linear-lanceolate or narrowly ovate, 30–110 × 8–20 mm, much reduced distally, bases rounded, margins entire, midnerves prominent, sometimes scabroso-strigillose basally to much of length, apices acute, faces glabrous, finely translucent gland-dotted.

1–4 mm, finely strigilloso-villous;

bracteoles 0–2, linear, grading into phyllaries.

thin, 2–8 mm, glabrate to finely puberulent, glabrous strips proximal to few linear-lanceolate bracteoles.

narrowly campanulate, 2.5–3.5 mm.

narrowly campanulate, 3.5–5 mm.

2–8;

laminae 1–2 × 0.25–0.5 mm.

3–4(–6);

laminae 1.4–2.5 × 0.4–0.9 mm.

2–4(–6);

corollas 2.3–3.5 mm, lobes 0.4–1 mm.

3–5;

corollas 2.7–3.5 mm, lobes 0.5–1.3 mm.

in 3–4 series, strongly unequal;

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

in 3–4 series, strongly unequal, yellowish, acute, glabrous;

outer narrowly ovate to lanceolate, inner lanceolate to linear-lanceolate.

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

(20–)75–350, in paniculiform arrays, openly secund, pyramidal, proximal to mid branches ascending to spreading, recurved, secund, 3–18 cm.

(narrowly obconic) 1 mm, strigillose;

pappi 2–3 mm.

(obconic) 1.4–2.3 mm, strigose to glabrate;

pappi 2.4–3 mm.

= 18.