Flora of North America species comparison

floccose-tomentose to canescent, sometimes unevenly glabrescent.

glabrous or ± lanate-tomentose.

1–(2–5).

usually multiple (little branched, arching-erect).

progressively reduced distally; petiolate;

blades oblong-ovate to oblanceolate, (5–)10–30 × 1.5–4(–6) cm, bases tapered, margins dentate (denticles, dark, callous; mid leaves similar, sessile, smaller; distal leaves bractlike).

± evenly distributed;

sessile or obscurely petiolate;

blades narrowly linear to filiform (or pinnatifid, the segments linear to filiform), 3–10(–12) cm, bases ± linear, ultimate margins entire or remotely toothed (fascicles of smaller leaves sometimes borne in axils of larger leaves).

(± 3) ± 5;

corolla laminae 5–8 mm.

usually ± 8 or ± 13, sometimes ± 21;

corolla laminae 10–15(–20) mm (mostly yellow, sometimes ochroleucous).

(± 5) ± 8, 6–8 mm, tips black.

± 13 or ± 21+, 5–10(–12) mm, tips green or minutely black.

of 2–5 linear bractlets (lengths to 1/3 phyllaries).

usually of 3–5+ bractlets (lengths often to 1/2+ phyllaries), sometimes 0.

20–60+ in corymbiform or subpaniculiform arrays.

(1–)3–10(–20+) in corymbiform or subcorymbiform clusters, often gathered in larger, showy arrays (involucres campanulate or cylindric).

glabrous.

hairy.

= 40. (A report of 2n = 46 is presumably erroneous.)

= 40.