Flora of North America species comparison

green (sometimes red-tinged), usually erect, branched mostly distally or ± throughout, glabrous, glabrate, puberulent, or sparsely strigillose to strigoso-sericeous (glabrescent, hairs mostly medifixed) and gland-dotted.

1–5+, erect to decumbent, usually branched, strigillose or strigoso-sericeous to villous (hairs medifixed), glabrescent [glabrous or sericeous to lanate].

blades 25–55 × 15–30 mm, 1–2-pinnately lobed.

mostly cauline; alternate; petiolate or sessile;

blades ± obovate to spatulate, 1–3-pinnately lobed, ultimate margins dentate to lobed, faces glabrous or strigillose to villous [glabrous or sericeous to lanate].

mostly (2–)4–6(–15) cm.

5–9 mm diam., ± villosulous to arachnose.

obconic to hemispheric or broader, 5–13[–20] mm diam.

paleate mostly distally;

paleae subulate to acerose 2–3+ mm (often gland-dotted).

hemispheric to narrowly conic, paleate (wholly or only distally);

paleae ± flat, scarious to indurate (subulate or elliptic to obovate with mucronate to acuminate-spinose tips).

10–15, styliferous and sterile;

corollas white, laminae 5–15+ mm.

[0 or 2–]5–20[–30+], pistillate and fertile or styliferous and sterile;

corollas usually white, rarely yellow or pink, laminae mostly oblong (tubes sometimes hairy).

2–2.5 mm (sparsely gland-dotted).

(60–)100–300+, bisexual, fertile;

corollas usually yellow, rarely pink, tubes ± cylindric (usually proximally dilated, ± spongy in fruit, sometimes hairy, not saccate), throats funnelform, lobes 5, ± triangular (abaxially minutely crested).

persistent, mostly 21–35+ in 3–5 series, distinct, deltate to lanceolate, oblong, or elliptic, unequal, margins and apices (hyaline and colorless or brownish [black]) scarious.

radiate [discoid], borne singly or in lax, corymbiform arrays (peduncles sometimes clavate and/or curved in fruit).

1.3–2 mm, ribs ± tuberculate (furrows often gland-dotted);

pappi 0.

obovoid to obconic or turbinate (circular or 4-angled in cross section), ribs usually 9–10 (0) and smooth or tuberculate, faces glabrous (pericarps with myxogenic cells);

pappi 0 or coroniform.

= 9.

= 18.