Flora of North America species comparison

glabrous or sparsely pilose.

glabrous.

basal and proximal cauline (arising from separated nodes) 1-nerved, linear to linear-lanceolate, 100–300 × 1–2(–2.5) mm, gradually or abruptly reduced distally, essentially glabrous, gland-dotted (proximal margins sometimes ciliate).

basal and proximal cauline 3–5-nerved, linear to linear-oblanceolate, 100–400 × 1–3(–5) mm, gradually reduced distally or abruptly on distal 1/2 of stems, essentially glabrous (bases of basal usually fibrous-persistent).

(ascending) 1–7 mm.

0.

turbinate-campanulate, 5–7 × 4–5 mm.

cylindro-turbinate, 6–7(–10) × ca. 3 mm.

4–6;

corolla tubes glabrous inside.

(2–)3–4(–5);

corolla tubes glabrous inside.

in 2–3(–4) series, lanceolate to oblong or elliptic-oblong, unequal, essentially glabrous, margins with (pinkish purple) hyaline borders, apices usually rounded-retuse and minutely involute-cuspidate to apiculate.

in 3–4 series, (often purple) oblong-oblanceolate to oblong-lanceolate, unequal, essentially glabrous, margins with hyaline borders, ciliolate, apices (erect or ± appressed) acuminate to acute.

in compact, racemiform arrays.

in dense, spiciform arrays.

2.5–4 mm;

pappi: lengths ± equaling corollas, bristles barbellate.

4–4.5 mm;

pappi: lengths ± equaling corollas, bristles barbellate to subplumose.

globose.

usually globose to subglobose, sometimes ovoid to elongate.

= 20.