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 scalelike (usually withering before flowering), cauline 1-nerved, mostly linear, 12–20(–230) × 1.2–3(–4.5) mm, gradually reduced beyond midstem, essentially glabrous (margins ciliate).

0.

(5–)12–40 mm.

cylindro-turbinate, 9–12 × 3.5–5 mm.

campanulate-turbinate, 10–19(–23) × (8–)10–17(–21) mm.

3–4(–5);

corolla tubes glabrate inside.

(11–)14–21(–25);

corolla tubes glabrous 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 series, (green or purple) lanceolate to linear-oblong, unequal, essentially glabrous or sparsely pilose, margins with or without hyaline borders, ciliate, apices long- to short-acuminate.

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

borne singly or (2–10) in subcorymbiform arrays.

4.5–6 mm;

pappi: lengths ± equaling corollas, bristles plumose.

(3.5–)5–7 mm (glabrous);

pappi: lengths ± 1/2–2/3 corollas, bristles barbellate.

globose or subglobose.

subglobose to depressed hemispheric.