Flora of North America species comparison

floccose-tomentose, unevenly glabrescent (persistently hairy on abaxial leaf faces).

arachnose, loosely tomentose, or villous (hairs crisped, jointed), glabrescent.

usually single, sometimes loosely clustered.

single.

± evenly distributed (basal and proximal sometimes withering before flowering);

petiolate (proximal) or sessile;

blades ovoid or oblong to spatulate (usually pinnatifid to pinnatisect, lobes ± lanceolate to linear), (3–)5–12 × (1.5–)2–4 cm, bases tapered to ± truncate, ultimate margins (often revolute) dentate or entire.

progressively reduced distally; ± petiolate;

blades elliptic, lanceolate, linear, oblanceolate, rounded-deltate, or suborbiculate, 6–25 × 1–6 cm, bases ± tapered or truncate to cordate, margins entire or ± dentate (distal leaves sessile, bractlike).

± 13;

corolla laminae 12–15 mm.

usually ± 8 or ± 13, sometimes 0;

corolla laminae 6–15(–20) mm (usually yellow, ochroleucous to white in one variety).

± 13, 5–7 mm, tips green or greenish.

usually ± 13 or ± 21, rarely ± 8, (4–)5–12(–15) mm, tips usually black, sometimes green.

of 4–6(–10) bractlets (lengths to 1/2 phyllaries).

of 1–5+ linear to filiform bractlets (seldom more than 2 mm).

20–60 in corymbiform arrays.

6–20(–40+) in corymbiform arrays (peduncle of terminal head often shorter than others).

hairy.

usually glabrous, sometimes hirtellous (mostly on angles).

= 40, 80.