Flora of North America species comparison

erect, densely pilose to hirsute or villoso-hirsute (hairs usually slightly ascending, loose, often mixed in orientations, of unequal lengths, relatively thin-based), eglandular.

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), (petioles prominently ciliate, hairs thick-based, spreading);

blades linear to linear-oblanceolate, 20–40 × 1–2 mm, margins entire, faces finely hirsute, eglandular;

cauline reduced, restricted to proximal 1/3 of stems.

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.

5–7 × 8–16 mm.

(2–)3–4 × 5–12 mm.

mostly 30–60;

corollas usually white, sometimes fading pink, rarely blue, 5–10 mm, laminae loosely coiling.

50–100;

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

2.8–4 mm.

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

in 2–3 series, hirsute to hirsuto-strigose, minutely 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).

1.8–2.2 mm, 2-nerved, faces moderately, loosely strigose;

pappi: outer of setae, inner of 15–25 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).