Flora of North America species comparison

sparsely and unevenly tomentose, glabrescent except in leaf axils and among heads.

loosely and sparsely arachnose to finely tomentose, unevenly glabrescent.

(often purplish-tinged) usually single, sometimes loosely clustered.

single.

± evenly distributed (basal often withering before flowering); petiolate (sometimes obscurely);

blades ovate to broadly ovate (usually 1–3-pinnate, lobes mostly obovate to spatulate), (4–)7–20(–30) × (1–)2–5(–12) cm, bases usually tapered, ultimate margins dentate (distal leaves similar, smaller).

progressively reduced distally; petiolate;

blades ovate or oblanceolate to oblong, 7–20 × 2–3 cm, bases broadly to narrowly tapered, margins repand-denticulate or sublaciniate to subentire (mid and distal leaves sessile, smaller, weakly clasping).

± 13;

corolla laminae 8–12 mm.

0 or 1–2;

corolla laminae 4–7 mm.

± 13, 3–4(–5) mm, tips black or greenish.

± 8 or ± 13, 4–8 mm, tips green or black.

of 2–6 (inconspicuous) bractlets (less than 2 mm).

0 or of 1–3+ oblong to linear bractlets (seldom more than 1.5 mm).

(10–)20–60+ in corymbiform arrays.

(6–)15–30+ in corymbiform arrays.

all sparsely hairy or ray cypselae glabrous.

glabrous.

= 40.

= 40.