Flora of North America species comparison

floccose-tomentose to canescent, sometimes unevenly glabrescent.

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

1–(2–5).

single (turgid).

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 (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).

(± 3) ± 5;

corolla laminae 5–8 mm.

usually ± 21, rarely 0;

corolla laminae 20–25 mm.

(± 5) ± 8, 6–8 mm, tips black.

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

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

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

20–60+ in corymbiform or subpaniculiform arrays.

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

glabrous.

glabrous.

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

= 40.