Flora of North America species comparison

erect, glabrous or sparsely hirsuto-pilose (hairs 0.5–1 mm), often minutely glandular distally.

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

basal (usually withering by flowering) and cauline;

basal blades oblanceolate-spatulate, 30–80(–150) × 4–18(–28) mm, margins entire, often ciliate (main veins sometimes also), faces glabrous, eglandular or distal sparsely minutely glandular;

cauline blades ovate to ovate-lanceolate, oblong-lanceolate, or lanceolate, nearly even-sized distally or sometimes mid largest (continuing to immediately below heads, bases usually clasping to subclasping).

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 × 11–22 mm.

(2–)3–4 × 5–12 mm.

75–150;

corollas blue to lavender, rarely whitish, 8–16 mm (mostly 1 mm wide), laminae slightly coiling at least at tips.

50–100;

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

4–5 mm.

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

in 2–3(–4) series, usually glabrous, sometimes sparsely hirsuto-pilose, minutely glandular.

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

(2–)4–20 in corymbiform arrays.

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

1.5–1.8 mm, 2(–4)-nerved, faces sparsely strigose;

pappi: outer of setae, inner of 20–30 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).