Flora of North America species comparison

3–15+, branched in distal 1/2, slender and wiry, glabrous.

erect, spreading, or sprawling, often much branched, glabrous or hispid to hispidulous, villous, or stipitate-glandular (especially distally).

basal often withering by flowering, 20–35 × 6–12 mm, pinnatifid;

cauline evenly spaced, blades oblong to linear, scalelike, 4–6 × 1–2 mm (except proximalmost), markedly reduced distally, margins usually entire, faces glabrous.

basal (sometimes persistent) and cauline; short-petiolate or sessile;

blades 1-nerved, lanceolate to oblanceolate or spatulate (bases tapering to clasping), margins entire, serrate, dentate, pinnatifid, or 2-pinnatifid (apices of blades, lobes, and teeth apiculate to bristle-tipped, bristles 1–4 mm), faces usually glabrous, hispid, hispidulous, or villous, sometimes also stipitate-glandular.

minutely glandular, if stipitate, then minutely so;

bracts 5–25, imbricate, grading into phyllaries.

hemispheric (narrowed at bases), 0.5–0.8 × 1–1.2 cm.

turbinate, campanulate, or hemispheric, (4–10 ×) 6–25 mm.

flat to convex, pitted (pit borders usually laciniate or irregularly bristly, the teeth or setae 0.1–2+ mm), epaleate.

15–25;

corollas yellow, tubes 3.5–4 mm, laminae 5–6 × 1.5–2.5 mm.

0 (in X. grindelioides and 2 Mexican taxa) or 12–60+, pistillate, fertile;

corollas white, pink, red-purple, purple, or yellow.

25–40+;

corollas 4.8–6.3 mm.

15–200+, bisexual, fertile;

corollas yellow, tubes length 1/4–1/3 ± funnelform throats (usually glabrous), lobes 5, spreading, triangular (glabrous or sparsely puberulent, hairs fine, antrorse);

style-branch appendages lanceolate.

in 5–6 series, oblong to linear-oblanceolate, 1.5–6.5 mm, apices acute, tipped by white bristle, faces minutely stipitate-glandular.

26–80+ in 2–8 series, appressed, spreading, or reflexed, 1-nerved (flat to rounded), linear to narrowly oblong or lanceolate, or enlarged distally into ovate to orbiculate or depressed-elliptic laminae, unequal, stiff, leathery, bases indurate, margins sometimes scarious, (apices herbaceous or achlorophyllous) faces hispid to hispidulous, villous, and/or stipitate-glandular.

radiate or discoid, borne singly or in corymbiform arrays.

narrowly obovoid to oblanceoloid, 1.5–2.5 mm, nerves 12–18, moderately tawny hairy;

pappi tawny, 3.5–6 mm, a few abaxial bristles to 1/3 of longest.

distinctly dimorphic (tan to red-brown or purple), ellipsoid to obovoid, oblong, or obscurely cordate, those of rays (if present) ± 3-sided, rounded abaxially, of disc compressed (thin or thick walled), 6–18-ribbed, faces silky (hairs antrorsely ascending to appressed);

pappi persistent, of 30–90+ usually whitish to brown or reddish brown, basally flattened (wider at overlapping bases), coarsely barbellate, apically attenuate bristles in 2–4 series.

= (2, 3, 4) 5.

= 8, 16.