Flora of North America species comparison

glabrous.

glabrous.

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.

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).

0 or (ascending) 2(–7) mm.

0.

turbinate, 6–8 × 5–7 mm.

cylindro-turbinate, 9–12 × 3.5–5 mm.

(7–)8–11(–13);

corolla tubes pilose inside.

3–4(–5);

corolla tubes glabrate inside.

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.

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

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

2.8–3.5(–3.8) mm;

pappi: lengths ± equaling corollas, bristles barbellate.

4.5–6 mm;

pappi: lengths ± equaling corollas, bristles plumose.

mostly globose.

globose or subglobose.

= 20.