Flora of North America species comparison

1–20+, erect, slender, glabrous proximally, hispid distally.

1–20+, erect (stout), conspicuously spreading-hirsute, at least distally.

basal and proximal cauline persistent, subpetiolate to sessile, blades sometimes 3-nerved, linear to linear-lanceolate, 60–100 × 7–10 mm, stiff, flat, margins entire or subentire, faces glabrous or sparsely hairy;

mid to distal cauline sessile, blades linear oblanceolate to linear, 20–40 × 3–5 mm, reduced distally, margins entire.

basal and proximal cauline usually withering by flowering except on new shoots, tapering to broadly winged petioles, blades oblanceolate, 30–50 × 8–15 mm, rapidly increasing in size distally, margins shallowly serrate, scabroso-strigose, faces often more densely hairy than distal;

mid to distal cauline numerous, crowded, sessile, blades lanceolate-ovate to elliptic-oblong, larger ones 35–120 × 8–35 mm, much reduced distally, bases broad and ± clasping, margins obscurely serrulate or entire, faces usually moderately hirsuto-villous on midnerves, often less so abaxially, adaxial sparsely strigose or glabrous.

29–36.5 mm, strigillose;

bracteoles linear.

2–8 mm, sparsely to moderately strigillose;

bracteoles 1–3, linear to linear-lanceolate, tending to group proximal to involucres, sometimes grading into phyllaries.

5–6 mm.

narrowly campanulate, 3.5–5.5 mm.

10–20, usually white, rarely pale yellow (conspicuous);

laminae 7–7.3 × 1.4–1.6 mm.

(2–)4–10;

laminae 1.2–2.5 × 0.2–0.5 mm.

30–36;

corollas 3.8–4.1 mm, lobes 0.5–0.7 mm.

(2–)4–7;

corollas 4–5 mm, lobes 0.5–1 mm.

in 4–5 series, usually prominently 1-nerved, linear, strongly unequal, outer acute, inner acute to obtuse, glabrous.

in 4–5 series, unequal, glabrous;

outer narrowly ovate-lanceolate, mid and inner linear-lanceolate.

1–25(–50), in corymbiform arrays.

35–500, in paniculiform arrays, usually dense, branches recurved-secund.

(obconic) 1–1.5 mm (ribbed), glabrous;

pappi 3.4–4 mm (apically clavate).

(narrowly obconic) 1.5–1.8 mm, sparsely strigillose, sometimes only apically;

pappi 3–4 mm.

= 18.

= 18.