Flora of North America species comparison

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

1–3+ (ridged), erect, branched (usually glabrous proximally, puberulent distally).

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.

mainly cauline; petiolate;

blades ovate to rounded-deltate, 4–10+ × 1.5–4 cm, usually 1–2-pinnately lobed (primary lobes 3–5+ pairs, ± ovate), ultimate margins pinnatifid to dentate, faces (at least abaxial) usually puberulent, gland-dotted.

5–10 mm diam.

5–7 mm diam.

convex to conic, epaleate.

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

10–21+ (more in “doubles”), pistillate, fertile;

corollas white, laminae 2–8(–12) mm.

2–3 mm.

ca. 2 mm.

20–200 in compact, corymbiform arrays.

5–20(–30) in corymbiform arrays.

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

pappi coroniform, 0.2–0.4 mm.

± columnar, 1–2 mm, 5–10-ribbed;

pappi 0 or coroniform, 0.1–0.2+ mm.

= 18.

= 18.