Flora of North America species comparison

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

1, erect, simple or branched (strigose, glabrate).

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.

basal and cauline; petiolate (proximal) or sessile (distal);

blades (basal and proximal cauline) mostly elliptic to oblong, 10–20 × 2–8 cm, usually not pinnately lobed (sometimes with 1–4+ lateral lobes near bases), margins ± crenate, faces usually silvery strigose or sericeous (at least when young), glabrescent, ± gland-dotted.

5–7 mm diam.

(3–)5–8(–10) mm diam. (phyllaries 40–60+ in 3–4+ series, tips usually ± dilated).

flat to convex.

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

corollas white, laminae 2–8(–12) mm.

usually 0 [sometimes 12–15, pistillate, fertile;

corollas white, laminae 4–6+ mm].

ca. 2 mm.

ca. 2 mm.

5–20(–30) in corymbiform arrays.

(3–)10–60+ in corymbiform arrays.

± columnar, 1–2 mm, 5–10-ribbed;

pappi 0 or coroniform, 0.1–0.2+ mm.

± columnar, 1.5–2 mm, 5–8-ribbed (with non-mucilaginous glands);

pappi coroniform, 0.1–0.4 mm (entire or ± toothed).

= 18.

= 18, 54.