Flora of North America species comparison

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

loosely arachno-tomentose, unevenly glabrescent.

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

single or clustered.

± 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; weakly petiolate;

blades lanceolate to narrowly oblanceolate, 10–18+ × 1–2(–3+) cm, bases tapered, margins entire or wavy (often with dark, cartilaginous denticles; mid leaves similar, smaller, sessile; distal leaves bractlike).

± 13;

corolla laminae 8–12 mm.

± 13;

corolla laminae (5–)15–20 mm.

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

± 21, 9–12(–14) mm, tips not notably blackened (short-hairy).

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

of 5–8+ linear to filiform bractlets (lengths 1/2–7/8+ phyllaries).

(10–)20–60+ in corymbiform arrays.

usually 1 (sometimes subtended by 1–2 smaller heads).

all sparsely hairy or ray cypselae glabrous.

glabrous.

= 40.

= 40.