Flora of North America species comparison

erect, distally villous (hairs with black cross walls), minutely glandular near heads.

erect or ascending, sparsely to moderately strigose to strigillose or hirsuto-strigillose (hairs usually ascending, rarely spreading, 0.1–1.2 mm), eglandular.

mostly basal (persistent), some cauline;

blades spatulate to oblanceolate, (10–)20–50(–150) × 4–6(–15) mm, cauline linear, bractlike, margins entire (apices rounded to retuse), faces glabrous or sparsely hirsute, eglandular.

basal (usually persistent through flowering) and cauline;

basal blades spatulate to broadly or narrowly oblanceolate to linear, (10–)30–150(–170) × 5–15(–21) mm;

cauline usually gradually reduced distally, continuing to near heads, margins entire or shallowly to deeply serrate or crenate, faces glabrous or glabrate to sparsely strigose or strigoso-hirsute, eglandular.

6–9 × 10–14 mm.

(2–)3–4 × 5–12 mm.

45–74;

corollas white to purple, 7–11 mm (mostly 1–2 mm wide), laminae spreading, tardily coiling.

50–100;

corollas white, less commonly pinkish or bluish, 4–6 mm, laminae coiling.

2.4–3.2 mm.

1.5–2.5 mm (throats sometimes slightly indurate and inflated).

in 2(–3) series, sparsely villoso-sericeous (hairs flattened, cross walls black, imparting distinct black color to involucres), glandular.

in 2–4 series, glabrous, strigose, or sparsely hirsute, sometimes minutely glandular.

1.

10–200+ in loosely corymbiform to paniculiform-corymbiform arrays (on distal branches).

(oblanceoloid-oblong) 2–2.3 mm, 2-nerved, faces strigoso-hirsute;

pappi: outer of setae, inner of 15–30 bristles.

(0.5–)0.9–1.2 mm, 2-nerved, faces sparsely strigose;

pappi: outer crowns of setae or scales, inner 0 (rays) or of 8–15 bristles (disc).

= 18.