Flora of North America species comparison

glabrous or sparsely and unevenly tomentose when young.

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

usually 1.

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

evenly distributed; petiolate;

blades ovate to oblanceolate, 2–10 × 0.5–2(–4) cm, bases tapered, margins lobulate to dentate, ultimate margins often secondarily dentate to denticulate (distal leaves sessile).

± 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).

0.

± 13;

corolla laminae 8–12 mm.

± 21, 4–6 mm, tips usually green, sometimes black.

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

of 2–4(–6+) bractlets (prominent, black-tipped, lengths about 1/4 phyllaries).

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

8–20 in loose, corymbiform arrays.

(10–)20–60+ in corymbiform arrays.

usually sparsely hairy, sometimes nearly glabrous.

all sparsely hairy or ray cypselae glabrous.

= 40.

= 40.