Flora of North America species comparison

glabrous or sparsely and unevenly tomentose when young.

sparsely hairy, unevenly glabrate (usually with persistent tomentum in leaf axils and on abaxial leaf faces).

usually 1.

usually multiple (arching upwards).

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 (proximal withering before flowering);

sessile or obscurely petiolate;

blades ± oblong or elliptic, (4–)6–10(–12) × 1.5–3 cm (1–2-pinnatifid, lobes ± linear, 1–2 mm wide), bases ± linear, ultimate margins entire.

0.

± 13;

corolla laminae 8–10 mm.

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

(± 13) ± 21, (5–)6–8 mm, tips minutely black.

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

0 or of 1–3+ (inconspicuous) bractlets.

8–20 in loose, corymbiform arrays.

4–12 in cymiform arrays (involucres campanulate, 8–15 mm diam.).

usually sparsely hairy, sometimes nearly glabrous.

hairy.

= 40.

= 40.