Flora of North America species comparison

glabrous or with tufts of white hairs in leaf axils.

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

usually 1 (branching distally, unevenly reddish, usually somewhat lax).

single (turgid).

evenly distributed;

petiolate (proximal) or sessile;

blades lanceolate to lance-linear, 3–10+ × (0.5–)1–2 cm, bases tapered (or auriculate), margins (sometimes revolute) unevenly dentate to subentire (mid and distal leaves similar, smaller, bases expanded, ± truncate to cordate, clasping).

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).

usually ± 8 or ± 13, rarely 0;

corolla laminae 8–10 mm.

usually ± 21, rarely 0;

corolla laminae 20–25 mm.

± 21, (4–)5–8 mm, tips often with minute black dots.

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

of 3–5+ linear to subulate bractlets (to 1.5 mm).

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

4–12 in loose, corymbiform arrays.

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

hairy.

glabrous.

= 40.