Flora of North America species comparison

glabrous.

glabrous.

basal and proximal cauline 1-nerved, linear to linear-lanceolate, 70–150 × 1–2.5 mm, abruptly or gradually reduced on distal 1/2 of stems, essentially glabrous (margins sometimes sparsely ciliate).

basal and proximal cauline 1-nerved, linear-oblanceolate to narrowly oblanceolate, 80–210 × 2–5(–10) mm, gradually or abruptly reduced distally, essentially glabrous (sparsely piloso-ciliate along proximal margins), gland-dotted.

0.

0 or (ascending) 2(–7) mm.

cylindro-turbinate, 9–12 × 3.5–5 mm.

turbinate, 6–8 × 5–7 mm.

3–4(–5);

corolla tubes glabrate inside.

(7–)8–11(–13);

corolla tubes pilose inside.

in 2–3 series, (often dark purple in anthesis) oblong-lanceolate to lanceolate-triangular, weakly unequal, essentially glabrous, margins without hyaline borders, sometimes sparsely ciliate, apices acute to acute-attenuate (sometimes with narrow tips).

in 3–4(–5) series, mostly oblong, unequal, essentially glabrous, margins with hyaline borders (0.2–0.4 mm wide), sometimes sparsely ciliolate, apices rounded.

(closely spaced, stems obscured) in dense, (cylindric) spiciform arrays.

in loose, racemiform arrays (internodes 2–14 mm).

4.5–6 mm;

pappi: lengths ± equaling corollas, bristles plumose.

2.8–3.5(–3.8) mm;

pappi: lengths ± equaling corollas, bristles barbellate.

globose or subglobose.

mostly globose.

= 20.