Flora of North America species comparison

1–2+ (ridged), erect, branched distally (glabrous or sparsely hairy).

1 or 2–5+, erect or prostrate to ascending, branched proximally and/or distally, glabrous or hairy (hairs basifixed and/or medifixed, sometimes stellate).

basal (soon withering) and cauline; petiolate or sessile;

blades broadly oblong or oval to elliptic, 4–20 × 2–10 cm, pinnately lobed (rachises ± winged, primary lobes 4–10 pairs, lance-linear to lanceolate or narrowly elliptic, often pinnately lobed or toothed), ultimate margins dentate, faces glabrous or sparsely hairy, gland-dotted.

basal and/or cauline; alternate; petiolate or sessile;

blades mostly obovate to spatulate, usually 1–3-pinnately lobed, ultimate margins entire, crenate, or dentate, faces glabrous or hairy.

5–10 mm diam.

mostly hemispheric or broader, (3–)5–22+ mm diam.

convex to conic, epaleate.

flat to conic or hemispheric (sometimes hairy), epaleate.

0 (heads disciform, peripheral pistillate florets ca. 20; corollas yellow, lobes 3–4).

usually 10–21+ (pistillate and fertile or neuter; corollas pale yellow to yellow or white, usually with yellowish bases [pink], laminae oblong to flabellate), sometimes 0 (in disciform or quasi-radiate or -radiant heads, peripheral pistillate florets 8–30+; corollas pale yellow, ± zygomorphic, lobes 3–4, sometimes ± raylike).

2–3 mm.

60–300+, bisexual, fertile;

corollas yellow, tubes ± cylindric, throats narrowly funnelform to campanulate, lobes (4–)5, ± deltate.

persistent, (20–)30–60+ in (2–)3–5+ series, distinct, ± ovate to oblong or oblong to lanceolate or lance-linear (sometimes carinate), unequal, margins and apices (pale to dark brown or blackish) scarious (tips sometimes dilated).

20–200 in compact, corymbiform arrays.

usually radiate, sometimes disciform (or quasi-radiate or -radiant), usually in lax to dense, corymbiform arrays, rarely borne singly.

1–2 mm, 4–5-angled or -ribbed, gland-dotted;

pappi coroniform, 0.2–0.4 mm.

obconic or ± columnar (circular in cross section), ribs (4–)5–10(–12+), faces usually gland-dotted, sometimes glabrous (pericarps without myxogenic cells or resin sacs, embryo sac development tetrasporic);

pappi usually coroniform, rarely 0 [distinct scales or each pappus an adaxial auricle].

= 9 (polyploidy).

= 18.