Flora of North America species comparison

arachno-tomentose to sericeous-lanate (especially on abaxial faces of phyllaries), unevenly glabrescent.

loosely arachno-tomentose, unevenly glabrescent.

single (turgid).

single or clustered.

evenly distributed (proximal withering before flowering);

subsessile or petiolate;

blades obovate to oblanceolate, 5–15(–25) × 2–6(–10) cm, bases tapered, margins serrate-dentate to denticulate or subentire (distal leaves slightly 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).

usually ± 21, rarely 0;

corolla laminae 20–25 mm.

± 13;

corolla laminae (5–)15–20 mm.

± 21, 8–15 mm (sometimes purplish or pinkish-tinged), tips greenish.

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

of 6–10 linear bractlets (longest nearly equaling phyllaries).

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

1–5(–15+) in corymbiform arrays (involucres notably large, 20–40 mm diam.).

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

glabrous.

glabrous.

= 40.

= 40.